chore(tech-debt): Remove built-in secret manager

[msukkari]

The built-in secret manager is an artifact of our deprecated cloud offering. It hasn't been supported for a while, and is unneeded tech debt. This PR completely removes the internal secret manager.

Tested the migration path and it works without errors when the Secrets table is empty. Surprisingly, it also seems to work when a secret is present (it just nukes the Secret table).

If you came to this PR because you've tried updating your Sourcebot deployment and are hitting issues with the DB migration, you will need to manually delete the Secret table in your DB. If you're using the internal DB then a clean wipe of your Sourcebot cache and restart should allow the migration to happen automatically. You'll need to switch to passing in secrets through environment variables (see docs for more details).

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch msukkarieh/deprecate_secret_manager

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[brendan-kellam]

love to see it

[brendan-kellam]

LGTM 👍