Update mock to test devfile with private parent

[maysunfaisal]

What does this PR do?:

Updates:

• the DownloadInMemory Mock implementation to return Devfiles with private parent
• the DownloadGitRepoResources Mock implementation to handle cases where a devfile/library client cannot provide Mock input data

Which issue(s) this PR fixes:

N/A

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 and linked to this PR, if they are not in the PR scope due to various constraints.

• Unit/Functional tests

• QE Integration test

• Documentation (READMEs, Product Docs, Blogs, Education Modules, etc.)

• Client Impact

• Gosec scans

How to test changes / Special notes to the reviewer:

Tests should pass

[codecov]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (20a0c91) 60.56% compared to head (10a737a) 60.42%.

Files	Patch %	Lines
pkg/devfile/parser/util/mock.go	57.14%	15 Missing ⚠️
pkg/util/mock.go	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #192      +/-   ##
==========================================
- Coverage   60.56%   60.42%   -0.14%     
==========================================
  Files          43       43              
  Lines        5061     5097      +36     
==========================================
+ Hits         3065     3080      +15     
- Misses       1806     1828      +22     
+ Partials      190      189       -1     

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: johnmcollier, kim-tsao, maysunfaisal
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