Is your feature request related to a problem? Please describe.
It seems qlpack.yml and codeql-pack.yml are equivalent (see github/codeql#20187), with qlpack.yml maybe being the canonical name. Using codeql pack init creates qlpack.yml.

Problem: The VS Code extension generates a codeql-pack.yml file. This is inconsistent and might cause confusion.

Describe the solution you'd like
The VS Code extension should use the canonical file name and match codeql pack init.

Describe alternatives you've considered
Keep the current behavior, codeql-pack.yml is more consistent with the lock file name codeql-pack.lock.yml.