fix: remove clientScript from page's block json

[stravo1]

Before this the component's clientScripts would be duplicated in the page's block JSON instead of being extended from the component block itself.

This PR fixes that and makes the clientScript attribute behave similar to how all other block attributes behave when extended from a component — not present in block JSON unless overridden.

[greptile-apps]

Confidence Score: 5/5

Logic is correct and the migration path handles both legacy and new data formats safely.

The clientScript reset + conditional merge in extend_block correctly mirrors how other attributes are handled. The legacy migration uses a falsy check so an empty {} still triggers it. No data-loss or incorrect-merge path identified.

No files require special attention.

_{Reviews (2): Last reviewed commit: "fix: handle case where both legacy and c..." | Re-trigger Greptile}

[codecov]

Codecov Report

❌ Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.54%. Comparing base (518e9e7) to head (5880b22).

Files with missing lines	Patch %	Lines
...ilder/builder/doctype/builder_page/builder_page.py	60.00%	4 Missing ⚠️
...der/doctype/builder_component/builder_component.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #663   +/-   ##
========================================
  Coverage    56.53%   56.54%           
========================================
  Files           34       34           
  Lines         4109     4119   +10     
========================================
+ Hits          2323     2329    +6     
- Misses        1786     1790    +4     

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[github-actions]

🎉 This PR is included in version 1.30.0 🎉

The release is available on GitHub release

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