Allow anonymous acceptance tests without credentials

[rilical]

I found that getTestMeta still attempted token or GitHub App credential setup when GH_TEST_AUTH_MODE=anonymous, so credential-free anonymous acceptance tests exited during setup. This change skips credential setup only for anonymous mode, and the authenticated paths are unchanged.

I added Test_getTestMeta_anonymousDoesNotRequireCredentials to cover the regression. I ran make test, go vet ./..., and CGO_ENABLED=0 go build ./...; gofmt -l . returned no files.

[github-actions]

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[stevehipwell]

@rilical I'm not sure I agree with the design here or even the problem description, at first glance this change looks to add significant complexity which goes against to Go idiom of making code as readable as possible. The acceptance test design is to gate the tests, the helpers are expected to fail if they're used by a test that doesn't have permission as this is a coding error.

FYI for a large change such as this it'd be best to open an issue to track the actual problem being solved rather than come with an implementation.

[rilical]

@stevehipwell Would you mind giving this another look?

[robert-crandall]

Thank you for simplifying this. This PR fixes a real problem of anonymous tests failing during setup.

[Copilot]

Pull request overview

These provider review instructions are being used. No blocking findings found.

Adds credential-free anonymous acceptance-test setup.

Changes:

• Skips credential configuration in anonymous mode.
• Adds regression coverage for anonymous metadata initialization.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
github/acc_test.go	Bypasses credentials for anonymous tests.
github/provider_test.go	Adds anonymous-mode regression test.

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[stevehipwell]

The code change looks good to me, but we don't need the test.

[stevehipwell]

LGTM

[stevehipwell]

@rilical if you can rebase your branch we can get this merged in.