chore: add unit tests for ListIntegrations and ListInvitations

[krishna28004]

Description

This PR adds unit test coverage for the ListIntegrations and ListInvitations gRPC endpoints.

Coverage Included

• organization isolation validation
• deterministic assertions to avoid flaky shared-state assumptions
• authenticated gRPC metadata context usage
• empty-state and populated-response behavior validation

Notes

The tests were written following existing repository conventions (support.Setup(t), deterministic assertions, and organization boundary validation patterns).

I validated formatting and repository conventions locally. Full local execution currently requires generated protobuf artifacts (pkg/protos/*) and compose-based setup workflows that are not yet configured in my environment, so CI will perform the final execution pass.

[superplanehq-integration]

👋 Commands for maintainers:

• /sp start - Start an ephemeral machine (takes ~30s)
• /sp stop - Stop a running machine (auto-executed on pr close)

[krishna28004]

Friendly follow-up on this PR. Please let me know if there are any concerns or changes needed from my side. Thanks for taking a look.

[shiroyasha]

Hey @krishna28004, sorry for the late late response, we had quite a few open pull-requests.
I'll assign @lucaspin to assess if we need these unit tests for integration listing.

[superplane-gh-integration-9000]

Risk: 8/100 (very low)

Summary

Adds a new test file with four unit tests for the ListIntegrations action covering empty list, single, multiple, and cross-org isolation cases; no production code is changed.

Concerns

• PR title claims 'ListInvitations' tests but none exist in the diff.
• Subtests share database state; 'multiple integrations' count check uses GreaterOrEqual instead of an exact assertion.
• 'multiple integrations' test depends on the integration created in the prior subtest running first.
• No test for error path (e.g., invalid org ID or DB failure).

Recommended reviewers: lucaspin

[shiroyasha]

/sem-approve

[shiroyasha]

/sem-approve

[shiroyasha]

Congrats on your first merged pull-requests @krishna28004! Thanks for contributing to SuperPlane.

[krishna28004]

Thank you! @shiroyasha, I appreciate the review and support. Looking forward to contributing more.