[MAINT] Add test for EMU Group Mapping state migration

[deiga]

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Before the change?

• EMU Group Mapping state migration v0 => v1 doesn't have a test

After the change?

• EMU Group Mapping state migration v0 => v1 doesn't has a test

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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[Copilot]

Pull request overview

These provider review instructions are being used. No blocking findings found.

Adds unit coverage for EMU Group Mapping state migration from v0 to v1.

Changes:

• Mocks required GitHub API responses.
• Verifies migrated team ID and resource ID state.

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