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.

It suppresses the following Lint issues:

• Unused resources for interpolator overshoot on aztec.
• Unused resources for drawables on aztec.
• Unused resources for format bar plugins cont on aztec.
• Unused resources for dimens on aztec.
• Unused resources for colors on aztec.
• Unused resources for strings on aztec.
• Unused resources for styles on aztec.
• Unused resources for link underline bool on aztec.

It resolves the following Lint issues:

• Obsolete sdk int version checks for aztec module.
• Redundant aztec text qualifier name.
• Obsolete sdk int version checks for app module.
• Unused resources for dimens on app.
• Unused resources for strings on app.

It created the following GitHub issues:

• CI - Missing Lint Artifacts (And CheckStyle) #964

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

• WordPress-Android

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

Merge

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

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).

Review

@[USER_NAME] TODO

Make sure strings will be translated:

• If there are new strings that have to be translated, I have added them to the client's strings.xml as a part of the integration PR.