Added edge case for re-enabling source on the MC settings page

[YuliaKrimerman]

Fix catalog source status feedback when re-enabling after disable

Description

Fixed a UI feedback issue where re-enabling a catalog source after disabling it showed "-" instead of "Starting" status, providing no feedback that the source was loading.

Root Cause:
When a catalog source is re-enabled:

• ConfigMap updates immediately: enabled: true
• Database/API response lags behind: status: DISABLED (until loading completes)
• Frontend only showed "Starting" for new sources (status=null), not for re-enabled sources (status=DISABLED)

Solution:
Updated CatalogSourceStatus.tsx to handle the ConfigMap/API mismatch. The component now shows "Starting" status when:

• ConfigMap indicates enabled: true (checked at line 24)
• AND API still returns status: DISABLED (caught in switch statement)

Code Changes:

• Leverages existing early return when enabled: false (line 24-26)
• When DISABLED case is reached in switch statement, we know enabled: true due to early return
• Simplified logic to return "Starting" label directly without redundant conditional check

User Experience:

• ✅ First time enabling: Shows "Starting" → "Available"/"Failed" (already worked)
• ✅ Re-enabling after disable: Shows "Starting" → "Available"/"Failed" (now fixed)
• ✅ Disabled source: Shows "-" (unchanged)

How Has This Been Tested?

• Manually tested the re-enable flow:
  1. Created a catalog source
  2. Disabled it (status shows "-")
  3. Re-enabled it (status now shows "Starting" instead of "-")
• Verified disabled sources still show "-"
• Verified first-time enable still shows "Starting"
• Code passes linter checks with no errors

Merge criteria:

• All the commits have been signed-off (To pass the DCO check)

• The commits have meaningful messages

• Automated tests are provided as part of the PR for major new functionalities; testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).

• The developer has manually tested the changes and verified that the changes work.

• Code changes follow the kubeflow contribution guidelines.

• For first time contributors: Please reach out to the Reviewers to ensure all tests are being run, ensuring the label ok-to-test has been added to the PR.

If you have UI changes

• The developer has added tests or explained why testing cannot be added.
  • Explanation: This is a UI timing/state synchronization fix. The existing component relies on early returns for control flow, and the fix leverages that existing logic. Manual testing confirms the fix works correctly.
• Included any necessary screenshots or gifs if it was a UI change.
• Verify that UI/UX changes conform the UX guidelines for Kubeflow.

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[manaswinidas]

any cypress test that needs to be changed coz of this change - surprised no tests failed - maybe tests are missing entirely for this case 🤔