fix(android): Remove AndroidRuntimeManager to prevent ANRs during SDK init (#5127)

* fix(android): Remove AndroidRuntimeManager to prevent ANRs during SDK init

StrictMode.setVmPolicy()/setThreadPolicy() calls inside
runWithRelaxedPolicy() triggered binder IPC on the main thread, causing
ANRs (SDK-CRASHES-JAVA-32FQ 34k+, SDK-CRASHES-JAVA-32PH 21k+,
SDK-CRASHES-JAVA-32Q9 18k+ events). StrictMode only logs warnings in
production by default, so relaxing it is unnecessary and harmful.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* changelog: Add entry for AndroidRuntimeManager removal

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(test): Remove initNotThrowStrictMode test

This test validated that StrictMode with penaltyDeath() didn't crash
during SDK init. Since we removed the RuntimeManager that relaxed
StrictMode, this test is no longer applicable — the SDK no longer
attempts to suppress StrictMode violations.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>