PWX-38400 : Do not attempt to delete plugin on non-openshift clusters

[nikita-bhatia]

What this PR does / why we need it:
While doing Portworx uninstall, all the components are deleted and for Plugin, even though plugin is not created on non-openshift clusters, operator tries to delete it.

• As a fix, added additional check to check if plugin is supported on the platform or not.

Which issue(s) this PR fixes (optional)
Closes # https://purestorage.atlassian.net/browse/PWX-38400

Special notes for your reviewer:

• Existing UT TestPluginInstallAndUninstall verifies the test of uninstall on OCP platform
• Manually verified on vanilla k8s and OCP platform install and uninstall of PX.

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 16 lines in your changes missing coverage. Please review.

Project coverage is 78.29%. Comparing base (30ed9ab) to head (c7a3ccf).

Files	Patch %	Lines
drivers/storage/portworx/component/plugin.go	20.00%	8 Missing and 8 partials ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           release-24.2.0    #1655      +/-   ##
==================================================
- Coverage           79.79%   78.29%   -1.50%     
==================================================
  Files                  61       61              
  Lines               18831    18833       +2     
==================================================
- Hits                15026    14746     -280     
- Misses               2715     3005     +290     
+ Partials             1090     1082       -8     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

This PR is stale because it has been in review for 3 days with no activity.