Remove unsupported version constraints

[koesie10]

This removes all CodeQL CLI version constraints for unsupported CLI versions (< 2.7.6). The oldest supported CLI version is 2.7.6 since GHES 3.4 recommends using CodeQL CLI 2.7.6.

I've also removed a constraint on version 2.7.1, but I'm not sure if we still support all 2.7.x versions.

Please double check that I made the correct transformations in call-sites, especially with regards to if conditions being true/false.

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[koesie10]

@aeisenberg Would you be able to confirm that we're not supporting the older 2.7 minor versions anymore?

[aeisenberg]

Yes. That's exactly right. 2.7.6 is the earliest version we need to support.

[aeisenberg]

Nice! It's great to be deleting all this old code.

One thing to consider is maybe we want to have a check during startup in extension.ts where we throw an error if the CLI version is < 2.7.6. Doing this or not should not block this PR.