test(connections): mock Slack validation before token revocation

[erichare]

After #15766 and #15767 merged, eight revocation cases failed while creating their connection because the fake Slack token reached the new auth.test validation call.

Mock successful validation before creating bot/user connections and use the existing RESPX fixture for revocation as well. App-level tokens still skip Web API validation. The tests retain all nine revocation cases, credential deletion, and repeated-revocation assertions. Production behavior is unchanged.

Validation:

• Reproduced 8 failures and 1 pass on 2d6c38d595 before the fix.
• 145 passed on Python 3.14: revocation and identity API tests plus the complete connection service test directory.
• Ruff format/check and git diff --check passed.

Addresses the reported regression.

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Reviewing files that changed from the base of the PR and between 2d6c38d and edc2f18.

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• src/backend/tests/unit/api/v1/test_connection_revocation.py

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| Return early? Yes. Return *something meaningful*? Also yes. |
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   \     /)/)
        ( '')
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      o(___)

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