[Docs] Consistently refer to either `codeql-pack.yml` or `qlpack.yml`

**Description of the issue**

Apparently `codeql-pack.yml` and `qlpack.yml` are equivalent:
https://github.com/github/codeql/blob/3674966946b395a9cc03f314b4d361f3c565ec97/docs/codeql/ql-language-reference/ql-language-specification.rst?plain=1#L67

This might be a source of confusion, so it would be good to at least consistently refer to this file only by one name[^1] (except for the specification mentioned above). Here are cases where `codeql-pack.yml` is currently used:
- `github/codeql`
- https://github.com/github/codeql/blob/3674966946b395a9cc03f314b4d361f3c565ec97/docs/codeql/codeql-language-guides/customizing-library-models-for-actions.rst?plain=1#L71
- ...?
- `github/docs`
- https://github.com/github/docs/blob/5f66400982b48a0f97b4dd2c85bb2677edd09206/content/code-security/code-scanning/managing-your-code-scanning-configuration/editing-your-configuration-of-default-setup.md?plain=1#L75
- ...?
- `github/vscode-codeql`
- https://github.com/github/vscode-codeql/issues/4104

Additionally it might be good to mention in https://docs.github.com/en/code-security/codeql-cli/using-the-advanced-functionality-of-the-codeql-cli/publishing-and-using-codeql-packs#about-qlpackyml-files that `codeql-pack.yml` is an alias.

What do you think?

[^1]: If the canonical name is `qlpack.yml`, then maybe prefer that, except that the lock file is named `codeql-pack.lock.yml` ...

Start with the referenced ql-language-specification.rst and customizing-library-models-for-actions.rst files, then inspect the linked GitHub Docs page and the vscode-codeql issue. Determine which filename should be canonical and check for other references across the named documentation. Done means the documentation uses one name consistently while retaining the specification exception and documenting the alias where appropriate.

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