[Deps] Update Kotlin to 2.0.21

[ParaskP7]

Project Thread: paaHJt-7n2-p2 Associated Metrics: paaHJt-7n2-p2#comment-9682

This PR updates Kotlin to 2.0 (2.0.21).

Description

FYI: I recommend reviewing this PR commit-by-commit just to make sure that Kotlin has been updated appropriately and that there isn't any left-overs that need addressing.

PS: Main commits for some extra focus:

• Build: Update jvm target & source/target compatibility to java 11
• Analysis: Resolve inline property bf warnings on woocommerce module
• Analysis: Resolve non-public primary ctor warning on woocommerce module

Testing information

• Smoke test the app and verify everything is working as expected.
• Try to test for build time increases both, locally and on CI.
• You could also run the ./gradlew buildHealth task locally and verify that everything is working as expected (CI).
• Review the project dependencies & build environment changes (via CI artifacts and assert correctness. (*)

(*) Unfortunately, this comment exceeds 65400 characters and thus the only way for us to check on the diff is to do it via the CI artifacts. You could focus on:

• tldr_diff_dependencies.txt

• tldr_diff_build_env.txt

• [x] I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• [x] The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• [x] Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• [x] Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on big (tablet) and small (phone) in case of UI changes, and no regressions are added.

[wpmobilebot]

Build environment changes

Content exceeds 65400 characters. Navigate to Buildkite build artifacts to see details.

[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	35ddc4aaf3cd3b66df461909109b124670f7ad15
	Direct Download	woocommerce-wear-prototype-build-pr12896-35ddc4a.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	35ddc4aaf3cd3b66df461909109b124670f7ad15
	Direct Download	woocommerce-prototype-build-pr12896-35ddc4a.apk

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 39.61%. Comparing base (3444338) to head (a65218c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## trunk #12896 +/- ## ============================================ - Coverage 40.17% 39.61% -0.57% - Complexity 5798 5918 +120 ============================================ Files 1258 1258 Lines 71547 72739 +1192 Branches 9979 9950 -29 ============================================ + Hits 28747 28813 +66 - Misses 40161 41362 +1201 + Partials 2639 2564 -75 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[ParaskP7]

👋 @wzieba !

Is there any place to review build performance changes for this update?

Don't you mean this: Associated Metrics: paaHJt-7n2-p2#comment-9682 (see PR description, on top) 🤔

Or, do you have something else in mind? 🤔

[wzieba]

Don't you mean this: Associated Metrics: paaHJt-7n2-p2#comment-9682 (see PR description, on top) 🤔

Yes, thanks!

[ParaskP7]

👋 @samiuelson !

You being part of the product team, are you able to code review/test this Kotlin 2.0 change before us merging this to trunk. In addition to the 👍 from Wojtek, I would love if someone from the product team gives the final 👍 . Else, let me know if you're not available. I will then re-assign this to someone with more bandwidth. 🙏

[ParaskP7]

Awesome @samiuelson , thanks for reviewing, testing and giving your final 👍 on this change, I update this PR with the latest changed from trunk, will wait on CI to go 🟢 and then merge this! 🙇 ❤️ 🚀