fix(settings): update ConnectedServices test for current API

[sreecharan-desu]

Because

The ConnectedServices tests started failing after recent changes, as they were still using the old groupedByName field.

This pull request

• Removes the outdated groupedByName usage
• Updates the tests to match the current return type
• Fixes the TypeScript build errors

Issue that this pull request solves

Closes: #17370

Checklist

• My commit is GPG signed.
• If applicable, I have modified or added tests which pass locally.

[sreecharan-desu]

Note: This supersedes the earlier PR (#19931), which I accidentally closed while resolving the signing and build issues.

[MagentaManifold]

I'm sorry, but this PR doesn't contain your earlier changes to the files, only updated tests. The updated test is also nonsensical.

[sreecharan-desu]

Thanks for catching that! I've restored the missing implementation file from the previous PR which I accidentally lost during the re-creation. The tests should make sense now as they align with the updated grouping logic.

[sreecharan-desu]

ConnectedServices tests are passing with the latest mock data updates:

    ✓ on disconnect, with more than one empty client name (13 ms)
    redirects to /signin when active session is signed out
      ✓ with single service session (60 ms)
      ✓ with multiple service sessions (13 ms)

Test Suites: 1 passed, 1 total
Tests:       25 passed, 25 total
Snapshots:   0 total
Time:        3.409 s
Ran all test suites matching /src\/components\/Settings\/ConnectedServices\/index.test.tsx/i.