Fix: Remove the default search dialog if it exists (on CMD + K)

[chmod77]

Why are the changes needed?

• Hitting CMD + K pops up two search dialogs (the docsearch and the default one)

What changes were proposed in this pull request?

This PR adds a script block that gracefully removes the default search dialog from the tree.

How was this patch tested?

1. Build
2. Serve
3. Hit CMD + K

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.98%. Comparing base (d770918) to head (152e332).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6106      +/-   ##
==========================================
- Coverage   36.99%   36.98%   -0.01%     
==========================================
  Files        1318     1318              
  Lines      132406   132439      +33     
==========================================
+ Hits        48979    48980       +1     
- Misses      79174    79206      +32     
  Partials     4253     4253              

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	54.06% <ø> (-0.05%)	⬇️
unittests-flytecopilot	30.99% <ø> (ø)
unittests-flytectl	62.29% <ø> (ø)
unittests-flyteidl	7.23% <ø> (-0.01%)	⬇️
unittests-flyteplugins	53.82% <ø> (ø)
unittests-flytepropeller	42.60% <ø> (ø)
unittests-flytestdlib	55.18% <ø> (+0.01%)	⬆️

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