Add label to LightningKokkos GPU CIs

[AmintorDusko]

Context: Add label to LightningKokkos GPU CIs
Also fixed the workflow activation logic.

Description of the Change:

Benefits:

Possible Drawbacks:

Related GitHub Issues:

[sc-74149]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.89%. Comparing base (1acb133) to head (83c0758).
Report is 1 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (1acb133) and HEAD (83c0758). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (1acb133)	HEAD (83c0758)
	7	5

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #916       +/-   ##
===========================================
- Coverage   92.42%   55.89%   -36.54%     
===========================================
  Files          95       24       -71     
  Lines       11968     2297     -9671     
===========================================
- Hits        11062     1284     -9778     
- Misses        906     1013      +107     

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[maliasadi]

Thanks @AmintorDusko!

[multiphaseCFD]

Thanks @AmintorDusko for the nice work!

[maliasadi]

🥳