Comment Detail: Add functionality for the Like button

[dvdchr]

Refs #17108
Depends on #17269. Please review this one first. 🙂

As titled, this adds functionality for the Like button. I've also ported the Like button animation from the previous implementation.

To test

Ensure that the New Comment Detail is enabled.

Scenario 1: Normal flow

• Go to My Site > Comments.
• Select any comment (preferably comments for testing purposes 😬 ).
• Press the Like button.
• Verify that the animation shows correctly.
• Verify that the Like button is recorded on the backend correctly (verify the like state on the web).
• Verify that the event is tracked successfully.

Testing the unlike flow:

• Press the Like button again.
• Verify that the unlike animation is shown correctly.
• Verify that the unlike action is reflected correctly (verify the like state on the web).
• Verify that the event is tracked successfully.

Scenario 2: Failed network request flow

• Set your network connection to a very slow mode (e.g. using a Network Link Conditioner).
• Select any comment.
• Tap on the Like button.
• Disable your connection while the network request is ongoing.
• Verify that after the like state is updated, it gets reverted back to the original state since the post request failed.

Scenario 3: Disabled connection flow

• Turn off your connection / enable airplane mode.
• Select any comment.
• Press the Like button.
• Verify that the state is not changed.

Regression Notes

1. Potential unintended areas of impact
   n/a. The feature is still hidden behind a flag.

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   n/a. The feature is still hidden behind a flag.

3. What automated tests I added (or what prevented me from doing so)
   n/a. The feature is still hidden behind a flag.

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• 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.

[peril-wordpress-mobile]

You can trigger an installable build for these changes by visiting CircleCI here.

[peril-wordpress-mobile]

You can trigger optional UI/connected tests for these changes by visiting CircleCI here.

[ScoutHarris]

(preferably comments for testing purposes 😬 )

Haha! Take all the fun out of spamming someone! 😆

[ScoutHarris]

Nice!