feat(spanner): inline BeginTransaction with the first statement (work in progress, do not review)#5307

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olavloite wants to merge 10 commits intogoogleapis:mainfrom

olavloite:spanner-inline-begin-tx-step-9

Commits on Apr 1, 2026

perf(spanner): inline BeginTransaction with first query (step 1)
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committed

Commits on Apr 2, 2026

perf(spanner): inline begin transaction error handling
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test(spanner): add integration test for inline-begin error handling
olavloite
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Commits on Apr 3, 2026

perf(spanner): support concurrent queries with inline-begin-transaction
olavloite
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Commits on Apr 4, 2026

fix(spanner): prevent deadlock if ResultSet#next() is never called
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Commits on Apr 5, 2026

Commits on Apr 7, 2026

Commits on Apr 8, 2026

Merge branch 'main' into spanner-inline-begin-tx-step-9
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