test: cover TableOfContentMarkdown component

[garv-sanveria]

What kind of change does this PR introduce?
Test coverage addition.

Issue Number:- Related to #2496
Others: No related issue, just adding missing component test coverage.

Screenshots/videos:
N/A (Just tests)

If relevant, did you update the documentation?
N/A

Summary
The TableOfContentMarkdown component currently had no test coverage. This PR adds a standard Cypress component test to verify that the markdown headings (h1, h2, h3) render correctly based on the depth prop.

[github-actions]

Hi @garv-sanveria! Thanks a lot for your contribution!

I noticed that the following required information is missing or incomplete: issue reference

Please update the PR description to include this information. You can find placeholders in the PR template for these items.

Thanks a lot!

[github-actions]

Hi @garv-sanveria! Thanks a lot for your contribution!

I noticed that the following required information is missing or incomplete: issue reference

Please update the PR description to include this information. You can find placeholders in the PR template for these items.

Thanks a lot!

[github-actions]

Hi @garv-sanveria! Thanks a lot for your contribution!

I noticed that the following required information is missing or incomplete: issue reference

Please update the PR description to include this information. You can find placeholders in the PR template for these items.

Thanks a lot!

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.35%. Comparing base (7b8104b) to head (951aa7f).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##              main    #2516      +/-   ##
===========================================
- Coverage   100.00%   98.35%   -1.65%     
===========================================
  Files           31       32       +1     
  Lines          695      731      +36     
  Branches       215      228      +13     
===========================================
+ Hits           695      719      +24     
- Misses           0       12      +12     

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