Add pre-JSON MySQL databases to new schema collector

[sethsamuel]

What does this PR do?

Adds support for MySQL databases without JSON aggregation to the new schema collector.

Motivation

The new collector is more efficient and enables backend performance optimizations.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
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[datadog-official]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.21%. Comparing base (f8fd12d) to head (7998794).

Additional details and impacted files

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[chatgpt-codex-connector]

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