[Crash] Revert "Lock shipping lines" PR

[kidinov]

Reverts woocommerce/woocommerce-android#12890

The PR causes a crash when a user attempts to edit an order

FATAL EXCEPTION: main
                                                                                                    Process: com.woocommerce.android.dev, PID: 16548
                                                                                                    java.lang.IllegalStateException: Multiple observers registered but only one is supported.
                                                                                                        at com.woocommerce.android.viewmodel.LiveDataDelegate.observe(LiveDataDelegate.kt:53)
                                                                                                        at com.woocommerce.android.ui.orders.creation.OrderCreateEditFormFragment.observeViewStateChanges(OrderCreateEditFormFragment.kt:484)
                                                                                                        at com.woocommerce.android.ui.orders.creation.OrderCreateEditFormFragment.setupObserversWith(OrderCreateEditFormFragment.kt:416)
                                                                                                        at com.woocommerce.android.ui.orders.creation.OrderCreateEditFormFragment.onViewCreated(OrderCreateEditFormFragment.kt:164)
                                                                                                        at androidx.fragment.app.Fragment.performViewCreated(Fragment.java:3152)
                                                                                                        at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:608)
                                                                                                        at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:286)
                                                                                                        at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2164)
                                                                                                        at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:2065)
                                                                                                        at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:2002)
                                                                                                        at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:702)
                                                                                                        at android.os.Handler.handleCallback(Handler.java:938)
                                                                                                        at android.os.Handler.dispatchMessage(Handler.java:99)
                                                                                                        at android.os.Looper.loopOnce(Looper.java:201)
                                                                                                        at android.os.Looper.loop(Looper.java:288)
                                                                                                        at android.app.ActivityThread.main(ActivityThread.java:7839)
                                                                                                        at java.lang.reflect.Method.invoke(Native Method)
                                                                                                        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
                                                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)

[dangermattic]

	1 Warning
:warning:	This PR is assigned to the milestone 21.1. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

Generated by :no_entry_sign: Danger

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce-Wear Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	b8ee086f618f97211277a43578a0d2afc32d2290
	Direct Download	woocommerce-wear-prototype-build-pr12892-b8ee086.apk

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	b8ee086f618f97211277a43578a0d2afc32d2290
	Direct Download	woocommerce-prototype-build-pr12892-b8ee086.apk

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 21.87500% with 25 lines in your changes missing coverage. Please review.

Project coverage is 40.21%. Comparing base (412ef4e) to head (b8ee086). Report is 3 commits behind head on trunk.

Files with missing lines	Patch %	Lines
...rders/creation/shipping/ShippingLineFormSection.kt	0.00%	24 Missing :warning:
...oid/ui/orders/creation/OrderCreateEditViewModel.kt	87.50%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## trunk #12892 +/- ## ========================================= Coverage 40.20% 40.21% + Complexity 5795 5793 -2 ========================================= Files 1256 1255 -1 Lines 71427 71397 -30 Branches 9973 9968 -5 ========================================= - Hits 28717 28711 -6 + Misses 40071 40048 -23 + Partials 2639 2638 -1 ```

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