[stable] [android] release background image readers on <= Android 14

[gmackall]

CP of #171193.

Template:

• Impacted Users (Approximately who will hit this issue, ex. all Flutter devs, Windows developers, all end-customers, apps using X framework feature).

All end users on Android 10-13 (inclusive) using an app with platform views.

• Impact Description (What is the impact? ex. visual jank on Samsung phones, app crash, cannot ship an iOS app. Does it impact development? ex. flutter doctor crashes when Android Studio is installed. Or shipping a production app? ex. the app crashes on launch).

Full app crash when backgrounding and then bringing the app back up.

• Workaround (Is there a workaround for this issue?)

No workaround.

• Risk (What is the risk level of this cherry-pick?)

Medium

• Test Coverage (Are you confident that your fix is well-tested by automated tests?)

No

• Validation Steps (What are the steps to validate that this fix works?)

Launch an app with platform views on these api levels and background them, and then bring the app back up.

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I signed the CLA.
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is test-exempt.
• I followed the breaking change policy and added Data Driven Fixes where supported.
• All existing and new tests are passing.

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[flutter-dashboard]

This pull request was opened from and to a release candidate branch. This should only be done as part of the official Flutter release process. If you are attempting to make a regular contribution to the Flutter project, please close this PR and follow the instructions at Tree Hygiene for detailed instructions on contributing to Flutter.

Reviewers: Use caution before merging pull requests to release branches. Ensure the proper procedure has been followed.

[camsim99]

Let's land it! :)