Stop using restricted APIs in WPMainNavigationView

[nbradbury]

Fixes #21079

We've been using restricted APIs in WPMainNavigationView, but it turns out this was never necessary. This PR drops the usage of the restricted APIs.

To test, simple ensure the bottom navigation bar looks and works as expected, including badging. To force badging on the notifications tag, change this function to always set the badge.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[wpmobilebot]

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

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21482-770fea9
	Commit	770fea9cea90b3082ce666c755050c97e0c64601
	Direct Download	jetpack-prototype-build-pr21482-770fea9.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

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

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21482-770fea9
	Commit	770fea9cea90b3082ce666c755050c97e0c64601
	Direct Download	wordpress-prototype-build-pr21482-770fea9.apk

Note: Google Login is not supported on these builds.

[dangermattic]

	2 Warnings
:warning:	View files have been modified, but no screenshot or video is included in the pull request. Consider adding some for clarity.
:warning:	PR is not assigned to a milestone.

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