Duplicate credentials in system info telem

[VakarisZ]

What does this PR do?

Removes the unnecessary "mimikatz" info from telemetry data since the exact same data is stored under "credentials" key

Couldn't find any usages or reason for duplicating credentials into "mimikatz" key

PR Checklist

• Have you added an explanation of what your changes do and why you'd like to include them?
• Is the TravisCI build passing?
• Was the CHANGELOG.md updated to reflect the changes?
• Was the documentation framework updated to reflect the changes?

Testing Checklist

• Added relevant unit tests?
• Have you successfully tested your changes locally? Elaborate:

  Tested by building monkey, gathering credentials, testing the report

• If applicable, add screenshots or log transcripts of the feature working

[codecov]

Codecov Report

Merging #1493 (d240427) into develop (e40c83c) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1493      +/-   ##
===========================================
- Coverage    42.26%   42.25%   -0.02%     
===========================================
  Files          475      475              
  Lines        14114    14113       -1     
===========================================
- Hits          5965     5963       -2     
- Misses        8149     8150       +1     

Impacted Files	Coverage Δ
...ction_monkey/system_info/windows_info_collector.py	0.00% <ø> (ø)
...nkey_island/cc/models/telemetries/telemetry_dal.py	91.30% <100.00%> (-8.70%)	⬇️

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