[Fixes #11920] Remove call to command rebuild_index in tasks.py

[etj]

#11920
Remove call to rebuild_index,
Supersedes #11921

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[gemini-code-assist]

Code Review

This pull request removes the execution of the 'rebuild_index' Django management command from the 'migrations' task in tasks.py. There are no review comments, and I have no feedback to provide.

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[Copilot]

Pull request overview

Removes an obsolete manage.py rebuild_index invocation from the migrations() Invoke task, aligning tasks.py with the post–Django 4.2 removal of Haystack and preventing the confusing “Type manage.py help for usage.” message reported in #11920.

Changes:

• Deleted the rebuild_index ctx.run(...) call from the migrations() task.
• Removed the surrounding broad try/except: pass block tied to that call.

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