fix: Add uuid to mock session objects in organization validation tests

[hariombalhara]

What does this PR do?

Fixes TypeScript type errors in organization validation test files caused by the parent PR #25963 which added uuid as a required field on Session.user.

After a recent merge brought in new test files (validateUserHasOrg.test.ts and validateUserHasOrgAdmin.test.ts), the mock session objects in these files were missing the required uuid property, causing 12 type errors during CI typecheck.

This PR adds uuid: "test-uuid-123" to all mock session user objects in both test files.

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. N/A - test file changes only.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

1. Run yarn type-check:ci --force and verify no type errors related to validateUserHasOrg.test.ts or validateUserHasOrgAdmin.test.ts
2. The CI typecheck job should pass after this fix

Human Review Checklist

• Verify uuid is added to all 12 mock session objects that were causing type errors (4 in validateUserHasOrg.test.ts, 8 in validateUserHasOrgAdmin.test.ts)
• Confirm the hardcoded test UUID value "test-uuid-123" is appropriate for test purposes (no test logic depends on unique UUIDs)

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Link to Devin run: https://app.devin.ai/sessions/b0276d8c67b14ebc8588f6c1ef40594e
Requested by: hariom@cal.com (@hariombalhara)

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[cubic-dev-ai]

No issues found across 2 files