chore: Improve error message for Read-only transaction with bounded staleness

[surbhigarg92]

This PR will improve error message for Read Only transactions when maxStaleness or minReadTimestamp is passed.

database.getSnapshot({maxStaleness: 100}, async (err, transaction) => {
    if (err) {
      console.error(err); // 'maxStaleness / minReadTimestamp is not supported for multi-use read-only transactions.'
      return;
    }
    try {
      const [qOneRows] = await transaction.run('SELECT SingerId, AlbumId, AlbumTitle FROM Albums');
    } finally {
      transaction.end();
      // Close the database when finished.
      await database.close();
    }
  });

[generated-files-bot]

Warning: This pull request is touching the following templated files:

• .kokoro/common.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/release/docs-devsite.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/release/docs.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/release/docs.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/release/publish.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/system-test.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/test.bat - .kokoro files are templated and should be updated in synthtool
• .kokoro/test.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/trampoline_v2.sh - .kokoro files are templated and should be updated in synthtool
• .github/workflows/ci.yaml - .github/workflows/ci.yaml (GitHub Actions) should be updated in synthtool