feat(observability): fix bugs found from product review + negative cases · googleapis/nodejs-spanner@f0b8745

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v3, actions/setup-node@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

The process '/usr/bin/git' failed with exit code 128

Run npm run lint: observability-test/batch-transaction.ts#L156

'REQUEST' is assigned a value but never used

Run npm run lint: observability-test/batch-transaction.ts#L158

'res' is assigned a value but never used

Run npm run lint: observability-test/batch-transaction.ts#L160

'part' is defined but never used

Run npm run lint: observability-test/batch-transaction.ts#L160

'resp' is defined but never used

Run npm run lint: observability-test/batch-transaction.ts#L225

'res' is assigned a value but never used

Run npm run lint: observability-test/batch-transaction.ts#L227

'part' is defined but never used

Run npm run lint: observability-test/batch-transaction.ts#L227

'resp' is defined but never used

Run npm run lint: observability-test/database.ts#L93

Unexpected any. Specify a different type

Run npm run lint: observability-test/database.ts#L507

'snapshotStub' is assigned a value but never used

Run npm run lint: observability-test/database.ts#L1175

'err' is defined but never used

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