fix(gcp): fix flaky tests from dns service

[danibarranqueroo]

Context

Some tests from DNS are failing during some Github runnings. I've noticed that when the CheckReportGCP try to assign the region to the location of the report if the MagicMock object of the test does not have region it could fail, so I added that to all the tests of this service.

Description

Added dns_client.region to all the unit tests of the service DNS from GCP.

Checklist

• Are there new checks included in this PR? Yes / No
  • If so, do we need to update permissions for the provider? Please review this carefully.
• Review if the code is being covered by tests.
• Review if code is being documented following this specification https://github.com/google/styleguide/blob/gh-pages/pyguide.md#38-comments-and-docstrings
• Review if backport is needed.
• Review if is needed to change the Readme.md

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.45%. Comparing base (31c80a6) to head (9d46c6a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6569   +/-   ##
=======================================
  Coverage   89.45%   89.45%           
=======================================
  Files        1182     1182           
  Lines       33785    33785           
=======================================
+ Hits        30221    30222    +1     
+ Misses       3564     3563    -1     

Flag	Coverage Δ
prowler	89.45% <ø> (+<0.01%)	⬆️

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Components	Coverage Δ
prowler	89.45% <ø> (+<0.01%)	⬆️
api	∅ <ø> (∅)

[prowler-bot]

💔 Some backports could not be created

Status	Branch	Result
❌	v4.6	An unhandled error occurred. Please see the logs for details
✅	v5.1

Manual backport

To create the backport manually run:

backport --pr 6569

Questions ?

Please refer to the Backport tool documentation and see the Github Action logs for details

[prowler-bot]

💚 All backports created successfully

Status	Branch	Result
✅	v4.6
✅	v5.1

Questions ?

Please refer to the Backport tool documentation and see the Github Action logs for details

[prowler-bot]

💚 All backports created successfully

Status	Branch	Result
✅	v4.6
✅	v5.1

Questions ?

Please refer to the Backport tool documentation and see the Github Action logs for details