Parallelize tests

[marceloneppel]

Issue

• Integration tests takes more than one hour to finish, even without, TLS, backups or more in depth high availability tests.

Solution

• Separate integration tests in multiple tox environment and Github CI jobs.

Context

• Some new markers were created to separate different tests.
• Some existing high availability related tests were marked with the charm_tests marker and will be checked again later when more in depth high availability tests are implemented.
• This is basically the same that was reviewed on Parallelize tests postgresql-k8s-operator#34, but for the VM charm now.

Testing

• Tested manually and on Github CI to ensure all the existing tests are considered in the new tox environments and jobs.

Release Notes

• Parallelize integration tests.

[codecov-commenter]

Codecov Report

Merging #26 (42a5b13) into password-rotation (62cc604) will not change coverage.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           password-rotation      #26   +/-   ##
==================================================
  Coverage              61.83%   61.83%           
==================================================
  Files                      6        6           
  Lines                    765      765           
  Branches                 119      119           
==================================================
  Hits                     473      473           
  Misses                   264      264           
  Partials                  28       28           

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