oracledb: various test fixes#4307

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mmatczuk wants to merge 9 commits intomainfrom

mmt/oracledb-fixes-v2

Commits on Apr 20, 2026

oracledb: increase integration test timeout from 10m to 30m
mmatczuk
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oracledb: handle LOB_TRIM events to establish LOB locator state
mmatczuk
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oracledb: use background context for deferred EndSession cleanup
mmatczuk
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oracledb: tolerate missing checkpoint cache table in CDC LOB toggle test
mmatczuk
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oracledb: guard nil stream in CDC LOB toggle test cleanup
mmatczuk
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oracledb: avoid data race in snapshot transaction rollback
mmatczuk
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oracledb: do not hardcode IDENTITY column values in streaming tests
mmatczuk
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oracledb: infer LOB locator for BASICFILE out-of-line LOBs
mmatczuk
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oracledb: infer LOB locator for BASICFILE out-of-line LOB INSERTs
mmatczuk
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