fix: Parse hostname correctly from repoURL to fetch correct CA cert

[svghadi]

Fixes #19138

getCAPath func doesn't correctly return the path for the tls cert if the repoURL passed contains path or port number without a schema. This is mainly because how the url.Parse() treats a url without schema. Stackoverflow REF
eg:

'registry.default/helm-charts' ---parsed-as---> 'registry.default/helm-charts'   #should be 'registry.default'
'registry.example.com:5000' ---parsed-as---> ''    # should be 'registry.example.com'

Below changes are made to ensure the hostname is correctly parsed to return a valid cert path(if present) belonging to the repoURL. The new change works like before for oci case where the schema oci:// is not part of repoURL string, no separate handling is required.

Change:

• Prepend repoURL with dummy schema if not present to ensure net/url correctly parse the hostname.
• Strip port number from hostname if any using net/url's Hostname() func.

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.83%. Comparing base (6296b17) to head (bfde103).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #19488      +/-   ##
==========================================
+ Coverage   55.79%   55.83%   +0.04%     
==========================================
  Files         316      316              
  Lines       43735    43737       +2     
==========================================
+ Hits        24402    24421      +19     
+ Misses      16780    16752      -28     
- Partials     2553     2564      +11     

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[jannfis]

LGTM!

[svghadi]

Thanks @jannfis.

@ishitasequeira - It would be great if this could be backported to 2.12.x and 2.11.x.

[ishitasequeira]

/cherry-pick release-2.12

[ishitasequeira]

/cherry-pick release-2.11