Applied Gradle Plugins Declaratively for Multiple Plugin Example Apps (#7968)

Updated applying gradle plugins from usage of imperative apply to usage
of declarative blocks {} apply for 7 plugins. Intending on updating all
android example apps under packages.

Previously migrated applying `path_provider` plugin example app from
imperatively to declaratively in this PR
[here](https://github.com/flutter/packages/pull/7822). Tests for changes
in the linked PR above.

More information on Flutter Gradle Pluggin Apply
[here](https://docs.flutter.dev/release/breaking-changes/flutter-gradle-plugin-apply)

Partially addresses
[#152656](https://github.com/flutter/flutter/issues/152656)

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
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responsibilities.
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auto-formatter. (Unlike the flutter/flutter repo, the flutter/packages
repo does use `dart format`.)
- [x] I signed the [CLA].
- [x] The title of the PR starts with the name of the package surrounded
by square brackets, e.g. `[shared_preferences]`
- [x] I [linked to at least one issue that this PR fixes] in the
description above.
- [x] I updated `pubspec.yaml` with an appropriate new version according
to the [pub versioning philosophy], or this PR is [exempt from version
changes].
- [x] I updated `CHANGELOG.md` to add a description of the change,
[following repository CHANGELOG style], or this PR is [exempt from
CHANGELOG changes].
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] All existing and new tests are passing.

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<!-- Links -->
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https://github.com/flutter/packages/blob/main/CONTRIBUTING.md
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https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md
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[CLA]: https://cla.developers.google.com/
[Discord]:
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[linked to at least one issue that this PR fixes]:
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[pub versioning philosophy]: https://dart.dev/tools/pub/versioning
[exempt from version changes]:
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[following repository CHANGELOG style]:
https://github.com/flutter/flutter/blob/master/docs/ecosystem/contributing/README.md#changelog-style
[exempt from CHANGELOG changes]:
https://github.com/flutter/flutter/blob/master/docs/ecosystem/contributing/README.md#changelog
[test-exempt]:
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21 files changed
tree: 912ce512f706c73867a74f5cc91c5ac3c559bb4a
  1. .ci/
  2. .github/
  3. packages/
  4. script/
  5. third_party/
  6. .ci.yaml
  7. .clang-format
  8. .gitattributes
  9. .gitignore
  10. .metadata
  11. analysis_options.yaml
  12. AUTHORS
  13. CODEOWNERS
  14. CONTRIBUTING.md
  15. customer_testing.bat
  16. customer_testing.sh
  17. LICENSE
  18. README.md
README.md

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image_pickerpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
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palette_generatorpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
path_parsingpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
path_providerpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
pigeonpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
pointer_interceptorpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
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processpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
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google_identity_services_webpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
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