Adding unit test for measurement with shots for LT with tn method

[LuisAlfredoNu]

Context:
With Lightning Tensor, ensure tn has feature parity with mps method.

Description of the Change:
Using the current testing suite for measurement, we change only the conftest.py file to make available the tn method with Lightning Tensor

Benefits:
Change only a few lines in the code.

Possible Drawbacks:
The testing time will increase double for Lightning Tensor 😞

Related GitHub Issues:

[sc-65726]

[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

All modified and coverable lines are covered by tests ✅

Project coverage is 92.42%. Comparing base (1782bbd) to head (5c2ac01).
Report is 2 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (1782bbd) and HEAD (5c2ac01). Click for more details.

HEAD has 55 uploads less than BASE

Flag	BASE (1782bbd)	HEAD (5c2ac01)
	64	9

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1027      +/-   ##
==========================================
- Coverage   97.93%   92.42%   -5.51%     
==========================================
  Files         233      112     -121     
  Lines       39910    16923   -22987     
==========================================
- Hits        39084    15641   -23443     
- Misses        826     1282     +456     

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[multiphaseCFD]

Thanks @LuisAlfredoNu .Please add this PR to changelog.

[maliasadi]

LGTM! 🙌

[josephleekl]

Looks good to me! Thanks @LuisAlfredoNu