refactor: redundant files and varaibles from balsamic

[ashwini06]

This PR:

Related #890

• Removes MSK_impact and MSK_impact_noStrelka json files from config
• Cleans up strelka, pindel , mutect2 variables from BALSAMIC

Review and tests:

• Tests pass
• Code review
• New code is executed and covered by tests, and test approve

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #903 (5bb4071) into develop (a80860c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #903   +/-   ##
========================================
  Coverage    99.54%   99.54%           
========================================
  Files           29       29           
  Lines         1770     1770           
========================================
  Hits          1762     1762           
  Misses           8        8           

Flag	Coverage Δ
unittests	99.54% <ø> (ø)

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

Impacted Files	Coverage Δ
BALSAMIC/constants/common.py	100.00% <ø> (ø)

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[ivadym]

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