Databases: only spin up the ones needed to avoid too much pulling

[bitterpanda63]

Summary by Aikido

Security Issues: 0	Quality Issues: 0	Resolved Issues: 0

⚡ Enhancements

• Started only postgres, mysql and mssql databases in CI.
• Added db matrix entries and conditionally started specific databases.
• Restricted test-ddtrace job to start only postgres database.
• Restricted opentel job to start only postgres database.
• Restricted benchmarks job to start only postgres database.

^{More info}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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