fix lightning interpreter with for, while, and cond

[albi3ro]

Context:

In PL PR #6786, I added additional kwargs for the for, while, and cond primitives for handling inputs with abstract shapes. Those inputs broken the custom registrations for the lightning interpreter.

Description of the Change:

Import the FlattenedHigherOrderPrimitives to get default behavior for for, while, and cond. These should better stay updated with changes to the primitives and the base class.

Benefits:

Lightning works again.

Possible Drawbacks:

Related GitHub Issues:

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit .github/CHANGELOG.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

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 33.25%. Comparing base (975bd1b) to head (3301a22).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pennylane_lightning/core/lightning_interpreter.py	0.00%	3 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (975bd1b) and HEAD (3301a22). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (975bd1b)	HEAD (3301a22)
	7	6

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1051       +/-   ##
===========================================
- Coverage   94.27%   33.25%   -61.02%     
===========================================
  Files         233       29      -204     
  Lines       39067     2607    -36460     
===========================================
- Hits        36830      867    -35963     
+ Misses       2237     1740      -497     

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[josephleekl]

Thanks @albi3ro! Could you also add a line in the changelog?

[josephleekl]

LGTM, thanks!