fix(gcp): test connection by verifying token

[prowler-bot]

Backport

This will backport the following commits from master to v5.7:

• fix(gcp): test connection by verifying token (#7882)

Questions ?

Please refer to the Backport tool documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.13%. Comparing base (300936f) to head (2b35f5b).
⚠️ Report is 32 commits behind head on v5.7.

Additional details and impacted files

@@            Coverage Diff             @@
##             v5.7    #7883      +/-   ##
==========================================
+ Coverage   75.21%   81.13%   +5.91%     
==========================================
  Files          71      182     +111     
  Lines        4564     7199    +2635     
==========================================
+ Hits         3433     5841    +2408     
- Misses       1131     1358     +227     

Flag	Coverage Δ
prowler	81.13% <100.00%> (+5.91%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
prowler	81.13% <100.00%> (+5.91%)	⬆️
api	∅ <ø> (∅)

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