Set code studio default env variable values to be masked

[shubham-bansal96]

Motivation
Recently we found that code studio environment variables like TOKEN_KEY, TOKEN_SECRET are being logged in sumo logic in plain text format, which is a security concern.
Fixes GL-1377

Proposed changes
In order to avoid logging env variable values in clear text format, we will be masking code studio default env variable.
In this PR we will setting all default env variable values as masked.

Alternatives considered

Testing steps
You can replicate this issue by creating a new project for code studio and check the env variables values under CI/CD variable. You will see currently default env values is not masked except ACQUIA_GLAB_TOKEN_SECRET.

Once these changes are deployed then you can verify the changes by creating a new project for code studio and run a pipeline with printing the default variables inside it. Now verify the job logs, You should not see value of default env variables in job logs.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (471793e) 91.76% compared to head (9372079) 91.76%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1586   +/-   ##
=========================================
  Coverage     91.76%   91.76%           
  Complexity     1809     1809           
=========================================
  Files           124      124           
  Lines          6471     6471           
=========================================
  Hits           5938     5938           
  Misses          533      533           

Files Changed	Coverage Δ
src/Command/CodeStudio/CodeStudioCiCdVariables.php	100.00% <100.00%> (ø)

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[anavarre]

@shubham-bansal96 this is a public repo. Requesting that we do not share sensitive information publicly. I have redacted the backlog URL.

[shubham-bansal96]

@shubham-bansal96 this is a public repo. Requesting that we do not share sensitive information publicly. I have redacted the backlog URL.

Thanks @anavarre for letting me know. Next time i will keep in my mind while raising a PR.

[shriacquia]

@shubham-bansal96 - Could you resolve the mutants reported? Here is the link for guidance.

[anavarre]

Thanks for your contribution. Dane returns in mid-October. We'll look into finalizing and merging this then

[danepowell]

Thanks for the PR!