fix: Make sure, that proxy-related environment variables are passed to git…

[vitaliy-guliy]

What does this PR do?

Applies #1093 to 7.30.x branch.

What issues does this PR fix or reference?

eclipse-che/che#19242

How to test this PR?

See original PR

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

Happy Path Channel

HAPPY_PATH_CHANNEL=next

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (7.30.x@dfe0671). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             7.30.x    #1122   +/-   ##
=========================================
  Coverage          ?   31.98%           
=========================================
  Files             ?      278           
  Lines             ?     9512           
  Branches          ?     1430           
=========================================
  Hits              ?     3042           
  Misses            ?     6374           
  Partials          ?       96           

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[ghatwala]

@nickboldt ^^ - For https://issues.redhat.com/browse/CRW-1836.