Gate downloading of git resources

[maysunfaisal]

What does this PR do?:

Gates the logic for downloading git resources. Clients od devfile/library may be running behind a proxy, so we cannot invoke git operations as they may fail

Which issue(s) this PR fixes:

Fixes devfile/api#1176

PR acceptance criteria:

Testing and documentation do not need to be complete in order for this PR to be approved. We just need to ensure tracking issues are opened.

• Open new test/doc issues under the devfile/api repo
• Check each criteria if:
• There is a separate tracking issue. Add the issue link under the criteria
  or
• test/doc updates are made as part of this PR
• If unchecked, explain why it's not needed

• Unit/Functional tests

• QE Integration test

• Documentation

• Client Impact

• Gosec scans

How to test changes / Special notes to the reviewer:

[codecov]

Codecov Report

Patch coverage: 81.25% and project coverage change: -0.02 ⚠️

Comparison is base (04a8b3f) 59.73% compared to head (cff5c26) 59.72%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #174      +/-   ##
==========================================
- Coverage   59.73%   59.72%   -0.02%     
==========================================
  Files          41       41              
  Lines        5119     5125       +6     
==========================================
+ Hits         3058     3061       +3     
- Misses       1866     1868       +2     
- Partials      195      196       +1     

Impacted Files	Coverage Δ
pkg/devfile/parser/parse.go	60.70% <81.25%> (-0.10%)	⬇️

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[mike-hoang]

Looks good! Should we add a small update to the readme doc about the new parser arg too?

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maysunfaisal, mike-hoang

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[maysunfaisal]

@mike-hoang README has been updated

[mike-hoang]

/lgtm