Add gotest adapter for standard Go tests

[gangwgr]

Similar to the Cypress adapter, this provides utilities for running standard Go tests (*_test.go) via OTE without modifying test code.

Key features:

• Operators compile test packages into binaries (go test -c)
• Binaries are embedded in OTE extension binary (go:embed)
• At runtime, binaries are extracted and executed
• No hardcoded logic - operators provide all metadata

Example usage:
//go:embed compiled_tests/*.test var embeddedTestBinaries embed.FS

metadata := []gotest.GoTestConfig{ {
TestName: "[sig-api-machinery] TestOperatorNamespace [Serial]",
BinaryName: "e2e.test",
TestPattern: "TestOperatorNamespace",
Tags: []string{"Serial"},
Lifecycle: "Informing",
},
}
specs, err := gotest.BuildExtensionTestSpecsFromGoTestMetadata(
metadata, embeddedTestBinaries, "compiled_tests",
)

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

Hi @gangwgr. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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