chore: remove Cohere from required integ test providers

[zastrowm]

Description

The Cohere API key used in CI is being revoked out of an abundance of safety after the LiteLLM dependency chain issue. While we sort out a proper key, removing it from the required providers list prevents the entire integration test session from failing when the key is absent.

Related Issues

N/A

Documentation PR

N/A

Type of Change

Bug fix

Testing

Verified the required_providers set no longer includes COHERE_API_KEY, so a missing key results in skipped tests rather than a session-level failure.

• I ran hatch run prepare

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-actions]

Assessment: Approve

Clean, focused change that addresses a legitimate security concern. The modification appropriately converts a session-level failure into graceful test skipping for Cohere tests.

Review Notes

• Change Scope: Single line removal from required_providers set - minimal and well-contained
• Test Behavior: Cohere tests will continue to work normally when the API key is present; when absent, tests are skipped via providers.cohere.mark rather than failing the entire session
• Documentation: Not required (CI/config change only)

LGTM! 👍