Add OAuth providers migration#191

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premtsd-code wants to merge 18 commits into

add-email-templates-migrationfrom

add-oauth-providers-migration

Commits on May 26, 2026

Add OAuth providers migration
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Commits on May 31, 2026

OAuth2: match sibling migration style for dispatch, report, and export
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OAuth2: DRY secret merge, surface unmapped providers, add tests
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Drop OAuth2 tests to match the lib's existing migration-resource coverage
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