Improve LightningModule hook tests

[carmocca]

What does this PR do?

• Create HookedLightningModule to append the called hooks dynamically. Any new hook will make the test fail. We want this so there's no forgetting to update the test.

Related to the Lightning hooks review: #7740

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[codecov]

Codecov Report

Merging #7944 (3b588a7) into master (436fc53) will decrease coverage by 0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #7944   +/-   ##
======================================
- Coverage      92%     91%   -0%     
======================================
  Files         203     203           
  Lines       13125   13127    +2     
======================================
- Hits        12012   11975   -37     
- Misses       1113    1152   +39