Use object for pack generation details

[charisk]

The generateQueryPack function in run-remote-query.ts currently has logic to calculate a few things like the QL pack root, paths to the query files, the language, etc. In order to add multi-query support, a few of these calculations need to be moved further up the stack and then passed in to generateQueryPack as arguments.

In this PR, we're introducing a new type (QlPackDetails) in the /variant-analysis domain to hold such information so that a single object can be passed in to generateQueryPack and using that to include the queryFile. In follow up PRs, we'll also need to move the language, and other related information. We'll also transition from a singular queryFile to multiple ones.

I'm not 100% convinced on the QlPackDetails name, so open to suggestions! We can also rename this once it has been fleshed out a bit more.

Checklist

N/A:

• 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.

[robertbrignull]

LGTM

One question which maybe doesn't have to be answered right now, and could get answered on its own as we flesh out this object. But could be good to think about now anyway so we avoid creating incorrect documentation.