FIX - CI configuration improvements

[Agnul97]

Basically, this PR is a "partial" port of this previous PR merged in develop #3785 that involved a lot of optimizations in the ci configuration.

Here, I changed these aspects of the configuration:

1. The caching mechanism was redundant between the actions/setup-java@v3 and actions/cache@v3 gitActions. I removed the caching in the first one to only have it in the second one.
2. The key used for the caching was wrong, for the same reason explained in point 4 of the pr FIX - Ci improvement - maven artifact caching and various tweaks #3785. I corrected it in the same way introducing the same "pr-commit-unique" key.
3. removed the restore-key parameter that was afflitected by the same problem of the point 3.

[codecov]

Codecov Report

Merging #3912 (9f0f7e8) into release-1.7.x (b188082) will decrease coverage by 0.06%.
The diff coverage is n/a.

Additional details and impacted files

@@                 Coverage Diff                 @@
##             release-1.7.x    #3912      +/-   ##
===================================================
- Coverage            49.68%   49.63%   -0.06%     
  Complexity             882      882              
===================================================
  Files                 1604     1604              
  Lines                36680    36680              
  Branches              3719     3719              
===================================================
- Hits                 18226    18206      -20     
- Misses               17261    17283      +22     
+ Partials              1193     1191       -2     

see 7 files with indirect coverage changes

[riccardomodanese]

looks good! thanks!