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docs(android): Document enablePerformanceV2 removal - #20464

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Updates the Android v9 documentation for the removal of the enablePerformanceV2 option in sentry-java#6458. Performance V2 is now always on.

  • Adds a "Removed Performance V2 Option" section to the v8-to-v9 migration guide, covering the removed option and manifest entry, what changes for apps that had turned it off, and the removed ActivityFramesTracker.
  • Removes the enable instructions from the Performance V2 page.
  • Drops wording on the features and automatic instrumentation pages that implies the option must be enabled.
  • Removes the "AndroidX Support" note from automatic instrumentation. Slow and frozen frames no longer use androidx FrameMetricsAggregator, so excluding androidx.core no longer turns them off.

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🤖 Generated with Claude Code

sentry-java 9.0 removes the enablePerformanceV2 option and its
io.sentry.performance-v2.enable manifest entry, so Performance V2 is
always on. It also deletes ActivityFramesTracker, the v1 slow and frozen
frames tracker built on androidx FrameMetricsAggregator.

Add a section to the v8-to-v9 migration guide, remove the enable
instructions from the Performance V2 page, and drop wording that
implies the option must be enabled. Remove the AndroidX Support note,
since excluding androidx.core no longer disables slow and frozen frames.

Refs getsentry/sentry-java#6458
Refs JAVA-527

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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