ref(proguard): Detect mappings from produced artifacts

[sentry-junior]

Detect ProGuard/R8 mapping availability from the produced mapping artifact instead of AGP minification flags. This removes the AGP 9.3 internal reflection boundary and should naturally support future optimization DSL changes.

Lazy mapping tasks

Mapping UUID and upload tasks are registered whenever mapping support is enabled, then skipped when no mapping file exists. Non-minified builds keep producing no UUID and no upload, while optimized builds use the existing artifact wiring.

Compatibility

The existing AGP 8.3+ toListenTo path and pre-8.3/DexGuard task wiring remain intact. The branch is based on #1376 so the design can be reviewed independently before deciding whether to replace that targeted fix.

Compilation succeeded. Targeted tests reached test compilation but the sandbox Gradle daemon was killed before execution; the Android integration test could not run because the sandbox has no Android SDK.

#skip-changelog

Requested by Roman Zavarnitsyn.

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Cursor Bugbot has reviewed your changes and found 2 potential issues.

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[0xadam-brown]

A few quick comments; otherwise lgtm (and also prefer this route to #1376) 👍

[0xadam-brown]

Can we narrow these to the known “provider has no value” / missing-artifact cases (and rethrow anything else)? Worried we might suppress exceptions we shouldn't....

[0xadam-brown]

Looks like we should also update creates proguard mapping tasks when app optimization is enabled() above. (It's still limited to --dry-run task-name presence, so presumably will pass even if execution-time detection never consumes a produced mapping.)