Fix pip changed status when installing from vcs

[sbettid]

SUMMARY

Fixes #81751.

The problem resided in the fact that pip list does not show the commit information related with modules installed from VCS, and this could lead to a wrong changed status reported, in case the module is installed again from a different branch or commit that does not change the version.

The main idea, as was mentioned also in the issue comments, is to incorporate in the check also the information reported by pip freeze, since this reports information also on the commit used when installing from VCS.

The related integration tests have been added to the existing ones.

ISSUE TYPE

• Bugfix Pull Request

ADDITIONAL INFORMATION

Starting from the following state, obtained using pip freeze:

-e git+https://github.com/dvarrazzo/pyiso8601@8bfaaa3e5c63a9eda4449e606786802f4e95ba60#egg=iso8601

and installing the module using a different commit (but same version), as follows

- name: install the same module from url pointing to a specific commit
      pip:
        name: "git+https://github.com/dvarrazzo/pyiso8601@8bfaaa3e5c63a9eda4449e606786802f4e95ba60#egg=iso8601"
        state: latest
        editable: true

the result would currently be:

PLAY [localhost] **********************************************************************

TASK [install the same module from url pointing to a specific commit] *****************
ok: [localhost]

PLAY RECAP ****************************************************************************
localhost                  : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0 

while, executing again pip freeze, we would notice the change:

-e git+https://github.com/dvarrazzo/pyiso8601@a48aa33f9fe5aa77d40fa2a38584750570d38ad6#egg=iso8601

After the fix, the execution will correctly report the changed status:

PLAY [localhost] *************************************************************************************************************************************************************

TASK [install the same module from url pointing to a specific commit] ********************************************************************************************************
changed: [localhost]

PLAY RECAP *******************************************************************************************************************************************************************
localhost                  : ok=1    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[webknjaz]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[webknjaz]

@mattclay @sivel this is an example PR that #84375 / #84402 would've helped with.