Refactor out io/ioutil

[michael-valdron]

Please specify the area for this PR

What does does this PR do / why we need it:

Refactor out io/ioutil module as part of Go 1.19 upgrade #212.

Which issue(s) this PR fixes:

Fixes #?

devfile/api#1469

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:

[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 27.27%. Comparing base (e51ee89) to head (d0cdba7).

Files	Patch %	Lines
index/server/pkg/server/endpoint.go	84.61%	2 Missing ⚠️
index/server/pkg/util/util.go	60.00%	2 Missing ⚠️
index/server/pkg/server/index.go	0.00%	1 Missing ⚠️
index/server/pkg/server/registry.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #224      +/-   ##
==========================================
+ Coverage   27.23%   27.27%   +0.04%     
==========================================
  Files           7        7              
  Lines        2012     2009       -3     
==========================================
  Hits          548      548              
+ Misses       1417     1414       -3     
  Partials       47       47              

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[michael-valdron]

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

N/A

[Jdubrick]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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

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