Add :libs:processors unit tests

[wzieba]

Description

This PR adds tests to kotlin poet's code generators used in :libs:processors module.

Initially, I also wanted to introduce tests for code generation itself, performed in RemoteConfigProcessor, using kotlin-compile-testing. Unfortunately, we have a cycle dependency: :libs:processors module doesn't have access to org.wordpress.android.util.config.AppConfig class, but uses it during code generation in RemoteFeatureConfigCheckBuilder, making it impossible to test.

Additionally, this PR updates kotlin poet version to the newest stable and addresses breaking changes.

To Test:

Unit test should be just fine.

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Regression Notes

1. Potential unintended areas of impact

   • Code generation of classes:
     • RemoteFeatureConfigCheck
     • FeaturesInDevelopment
     • RemoteFeatureConfigDefaults
     • RemoteFieldConfigDefaults

2. What I did to test those areas of impact (or what existing automated tests I relied on)

   • I wrote unit tests and smoke tested the app

3. What automated tests I added (or what prevented me from doing so)

   • Unit tests

---

PR Submission Checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

---

Testing Checklist:

• WordPress.com sites and self-hosted Jetpack sites.
• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• Talkback.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• Large and small screen sizes. (Tablet and smaller phones)
• Multi-tasking: Split screen and Pop-up view. (Android 10 or higher)

[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	pr20213-ec1baba
	Commit	ec1baba
	Direct Download	jetpack-prototype-build-pr20213-ec1baba.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	pr20213-ec1baba
	Commit	ec1baba
	Direct Download	wordpress-prototype-build-pr20213-ec1baba.apk

Note: Google Login is not supported on these builds.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (db5bbc7) 40.18% compared to head (ec1baba) 40.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk   #20213      +/-   ##
==========================================
+ Coverage   40.18%   40.31%   +0.13%     
==========================================
  Files        1469     1469              
  Lines       67672    67672              
  Branches    11211    11211              
==========================================
+ Hits        27193    27281      +88     
+ Misses      37985    37897      -88     
  Partials     2494     2494              

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[antonis]

Thank you for your work on this @wzieba 🙇
The code changes look consistent to me and the added tests make sense. I also didn't notice any side effects in the code generation 🎉