Fix CI breakage from no-test coverage handling and deprecated setup-go action

[Copilot]

Base branch CI was failing even when tests passed: make test exited non-zero due to go: no such tool "covdata" on coverage processing, and workflows were still pinned to deprecated actions/setup-go@v3.

• CI workflow modernization

  • Updated Go setup action in CI workflows:
    • .github/workflows/go.yml
    • .github/workflows/go-pr.yml
  • Replaced actions/setup-go@v3 with actions/setup-go@v5.

• Makefile test target hardening

  • Changed make test to compute package list from go list and include only packages that actually contain test files.
  • Coverage output is now generated only for test-bearing packages, avoiding covdata failures caused by coverage processing on no-test packages.

• Behavioral impact

  • Preserves current test execution flow and coverage generation (cover.out) for real test packages.
  • Removes CI instability from packages under ./... that have code but no _test.go files.

@TEST_PKGS=$$(go list -tags $(BUILD_TAGS) -f '{{if or .TestGoFiles .XTestGoFiles}}{{.ImportPath}}{{end}}' $(GO_TARGET)); \
if [ -n "$$TEST_PKGS" ]; then \
	go test -tags $(BUILD_TAGS) -v $$TEST_PKGS -coverprofile cover.out; \
else \
	go test -tags $(BUILD_TAGS) -v $(GO_TARGET); \
fi

[openshift-ci]

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