Fix LocalHilbertSchmidt template

[albi3ro]

[sc-48521]

When run with a QNode, the LocalHilbertSchmidt template raises:

RuntimeError: No queuing context available to append operation to.

The decomposition uses qml.apply without checking that something is recording. This failure was not found because there were no integration tests checking that the template worked in a QNode.

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit doc/releases/changelog-dev.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (v0.33.0-rc0@02659eb). Click here to learn what that means.

Additional details and impacted files

@@              Coverage Diff               @@
##             v0.33.0-rc0    #4719   +/-   ##
==============================================
  Coverage               ?   99.64%           
==============================================
  Files                  ?      380           
  Lines                  ?    33985           
  Branches               ?        0           
==============================================
  Hits                   ?    33863           
  Misses                 ?      122           
  Partials               ?        0           

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[rmoyard]

Thank you, good catch 👍

[timmysilv]

lgtm! will make sure my branch is correctly updated