fix(firestore,android): abort timed-out transactions without crashing on a later get

[SelaseKay]

Description

Android runTransaction timed out by returning a failed result from the native update callback. The Firestore SDK treated that as success, committed, and a later transaction.get hit ensureCommitNotCalled. AssertionError is not an Exception, so the process died instead of Dart seeing deadline-exceeded.

Abort the callback with a non-retryable error (still mapped to deadline-exceeded) and catch Throwable in transactionGet.

Related Issues

• Fixes [cloud_firestore][Android]: Transaction callback timeout can cause fatal assertion on subsequent read #18666

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Breaking Change

• Yes, this is a breaking change.
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[russellwheatley]

LGTM