Add test coverage for PullStackFromRegistry and PullStackByMediaTypes…

[kim-tsao]

Please specify the area for this PR
/area registry

What does does this PR do / why we need it:
Adds additional coverage to our registry library to test the downloading of stack resources

Which issue(s) this PR fixes:
Fixes #?
devfile/api#1094

PR acceptance criteria:

• Test Coverage
  • Are your changes sufficiently tested, and are any applicable test cases added or updated to cover your changes?

Documentation (WIP)

• Does the REST API doc need to be updated with your changes?
• Does the registry library doc need to be updated with your changes?

How to test changes / Special notes to the reviewer:

[openshift-ci]

@kim-tsao: The label(s) area/registry cannot be applied, because the repository doesn't have them.

In response to this:

…FromRegistry

Please specify the area for this PR
/area registry

What does does this PR do / why we need it:
Adds additional coverage to our registry library to test the downloading of stack resources

Which issue(s) this PR fixes:
Fixes #?
devfile/api#1094

PR acceptance criteria:

• Test Coverage
  • Are your changes sufficiently tested, and are any applicable test cases added or updated to cover your changes?

Documentation (WIP)

• Does the REST API doc need to be updated with your changes?
• Does the registry library doc need to be updated with your changes?

How to test changes / Special notes to the reviewer:

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (ff8153b) 42.28% compared to head (206b650) 42.28%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #172   +/-   ##
=======================================
  Coverage   42.28%   42.28%           
=======================================
  Files           6        6           
  Lines        1057     1057           
=======================================
  Hits          447      447           
  Misses        567      567           
  Partials       43       43           

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[michael-valdron]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kim-tsao, michael-valdron
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