[many} Update all examples apps to use java 17 complile options

[reidbaker]

Part 1/2 for flutter/flutter/issues/176027

CHANGELOG exemption: Example apps only. #10186 (comment)
Tool test will come in part 2 after the non examples have been updated.

Pre-Review Checklist

• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• I read the [Tree Hygiene] page, which explains my responsibilities.
• I read and followed the [relevant style guides] and ran [the auto-formatter].
• I signed the [CLA].
• The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• I [linked to at least one issue that this PR fixes] in the description above.
• I updated pubspec.yaml with an appropriate new version according to the [pub versioning philosophy], or I have commented below to indicate which [version change exemption] this PR falls under[^1].
• I updated CHANGELOG.md to add a description of the change, [following repository CHANGELOG style], or I have commented below to indicate which [CHANGELOG exemption] this PR falls under[^1].
• I updated/added any relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or I have commented below to indicate which [test exemption] this PR falls under[^1].
• All existing and new tests are passing.

[gemini-code-assist]

Code Review

This pull request updates the Java compile options to version 17 for a large number of example applications. The changes are generally correct, but I've identified a few inconsistencies. Two files set the jvmTarget for Kotlin differently from the rest, and one file is missing the compileOptions block altogether, which is the main purpose of this PR. My review comments provide suggestions to address these for consistency and completeness.

[gemini-code-assist]

This file is missing the compileOptions block to set the Java source and target compatibility to version 17. To complete the update for this example app, please add the following block, preferably before kotlinOptions:

    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_17
        targetCompatibility = JavaVersion.VERSION_17
    }

[bparrishMines]

LGTM

[bparrishMines]

nit: I think the README change technically requires a version bump, but it looks like this change won't affect clients anyways. So I'm fine with not needing to publish this change.