Upgrade Gradle to 7.4 & AGP to 7.1.1

[ParaskP7]

This PR upgrades Gradle to 7.4 & AGP to 7.1.1.

It includes the following:

• Gradle version upgraded to 7.3.3 with the ./gradlew wrapper --gradle-version=7.3.3 --distribution-type=all command.
• AGP version upgrade to 7.0.4 (see settings.gradle change).
• Build output diff:
  • To identify and fix new warnings/errors that got added.
  • To identify and verify old warnings/errors that got removed.
• Lint output diff
  • To identify and fix new warnings/errors that got added.
  • To identify and verify old warnings/errors that got removed.
• The above 4 steps were redone with a follow-up update to Gradle 7.4 & AGP 7.1.1.
• Update buildkite docker android build image to 1.2.0.

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It suppresses the following Lint issues:

• Unused resources for strings on mp4 compose.
• Unused resources for dimens on photo editor.
• Unused resources for dimens on stories.
• Unused resources for colors on stories.
• Unused resources for strings on stories.
• Unused resources for pop animation on stories.
• Recycler view for emoji picker fragment on stories.
• Unused resources for all dimens on app.
• Unused resources for all colors on app.
• Unused resources for strings on app.
• Unused resources for edit text style on app.
• Typos for font certs on app.
• Unused resources for media par button drawable on app.
• Content description for fab views on app.

It disables the following Lint issues:

• Icon location errors on app.

It resolves the following Lint issues:

• Unused resources for background drawable on app.
• Content description for image views on app.

It created the following GitHub issues:

• CI - Missing Lint Artifacts (And CheckStyle) #720

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Besides the above, you can reference the Gradle 7.4 & AGP 7.1.1 PRs of the below clients for testing/verification purposes:

• [x] WordPress-Android

NOTE: This is a draft PR because all Gradle & AGP upgrade PRs need to be merged together.

Merge Instructions

• [x] Mark PR as Ready for review and assign https://github.com/orgs/wordpress-mobile/teams/owl-team to it.
• [x] Wait for PR to get approved.
• [x] Merge this PR (in coordination with all the other library PRs).

To Test

1. Smoke test the example app.
2. CI checks will cover everything in terms of testing.
3. Testing composite builds and respective clients will be enough (see above).

[peril-automattic[bot]]

You can test the changes on this Pull Request by downloading the APK here.