Fix test references to GitHub organization name

[pelikhan]

Update tests and related functions to reference the correct GitHub organization name, ensuring consistency across the codebase.

[Copilot]

Pull request overview

Updates the JavaScript test suite and related helper documentation to consistently reference the correct GitHub organization name (github) instead of githubnext.

Changes:

• Updated hardcoded GitHub org references in unit tests to use github.
• Updated the live API test script configuration to query github/gh-aw.
• Adjusted inline documentation examples in repo_helpers.cjs to match the updated org.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
actions/setup/js/update_project.test.cjs	Updates the Projects v2 test URL to use the github org.
actions/setup/js/test-live-github-api.cjs	Switches the live API script’s owner to github.
actions/setup/js/repo_helpers.test.cjs	Updates default repo/org expectations in repo validation tests.
actions/setup/js/repo_helpers.cjs	Updates doc comment example to reference github/something.
actions/setup/js/frontmatter_hash_github_api.test.cjs	Updates GitHub API-based hash tests to use owner = "github".

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