🐛 Fix TestParseSubscriptionConfig to work with vendor mode

[jianzhangbjz]

Description

To address openshift/operator-framework-operator-controller#615 (comment)

--- FAIL: TestParseSubscriptionConfig (0.07s)
    main_test.go:78: 
        	Error Trace:	/go/src/github.com/openshift/operator-framework-operator-controller/hack/tools/schema-generator/main_test.go:78
        	Error:      	Received unexpected error:
        	            	open pkg/operators/v1alpha1/subscription_types.go: no such file or directory
        	Test:       	TestParseSubscriptionConfig
        	Messages:   	should successfully parse SubscriptionConfig
FAIL
coverage: 31.5% of statements

The getModulePath helper function uses go list -mod=readonly to find module paths from the Go module cache. This works in development environments but fails in vendor mode builds where:

1. The module cache may not be populated
2. The -mod=readonly flag bypasses the vendor directory

This causes the test to fail with: open pkg/operators/v1alpha1/subscription_types.go: no such file or directory
Update getModulePath to first check for the module in the vendor directory before falling back to the Go module cache. This ensures the test works in both:

• Development environments (using Go module cache)
• Vendor mode builds like OpenShift CI (using vendor directory)

Modified getModulePath in hack/tools/schema-generator/main_test.go to:
1. Check if module exists in vendor/<module-path>
2. Check relative path from test directory (../../../vendor/<module-path>)
3. Fall back to go list -mod=readonly for module cache lookup

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.50%. Comparing base (12923b9) to head (4fdd166).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2466   +/-   ##
=======================================
  Coverage   69.50%   69.50%           
=======================================
  Files         102      102           
  Lines        8231     8231           
=======================================
  Hits         5721     5721           
  Misses       2057     2057           
  Partials      453      453           

Flag	Coverage Δ
e2e	46.90% <ø> (ø)
experimental-e2e	13.37% <ø> (ø)
unit	57.55% <ø> (ø)

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: grokspawn

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