fix the invalid kube yaml causing panic issue

[yangcao77]

What does this PR do?:

This PR updates the kubeyaml parser to use unmarshal to ensure the kube yaml is in the expected format. to avoid the panic when trying to convert an interface{} into a 'map[string]interface {}'

panic: interface conversion: interface {} is string, not map[string]interface {} [recovered]
	panic: interface conversion: interface {} is string, not map[string]interface {}

Which issue(s) this PR fixes:

for has bug: https://issues.redhat.com/browse/RHTAPBUGS-113

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: 100.00% and project coverage change: +0.03 🎉

Comparison is base (c1b23d2) 61.28% compared to head (d3d4fe8) 61.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #171      +/-   ##
==========================================
+ Coverage   61.28%   61.32%   +0.03%     
==========================================
  Files          37       37              
  Lines        4373     4377       +4     
==========================================
+ Hits         2680     2684       +4     
  Misses       1531     1531              
  Partials      162      162              

Impacted Files	Coverage Δ
pkg/devfile/parser/reader.go	92.85% <100.00%> (+0.35%)	⬆️

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[maysunfaisal]

comment

[yangcao77]

updated

[maysunfaisal]

where are we setting this? We are using it but i dont see it being set a value

[yangcao77]

library/pkg/devfile/parser/reader_test.go

Line 177 in 88946b6

if tt.testParseYamlOnly {

[maysunfaisal]

@yangcao77 tests failing

[yangcao77]

@maysunfaisal fixed the test failure. can you help review again ? thanks

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maysunfaisal, yangcao77

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