Look in all workspace folders for PSSA settings file

[andyleejordan]

Mostly investigating PowerShell/vscode-powershell#4743.

[andyleejordan]

@JustinGrote @SeeminglyScience would you two mind reviewing this? I think there's reason enough to get it in. It doesn't fix everything since the logic is just "find the first PSSA config" and not a specific folder's config, but the latter is a big ask and the former at least gives a solution to multi-root repos. And it's come up a few times now.

[JustinGrote]

@andyleejordan I couldn't really tell but does it look thru the workspaces in a deterministic fashion? My thought was that since you can specify the folder order in the workspace, if it always goes thru the folder order, then a user can define the "primary" analyzer by putting that folder to the top.

Also agreed a per-folder analysis config that also applies different rules to each folder is a way larger ask.

[andyleejordan]

Yes, it should iterate over the workspace folders deterministically and in the order supplied. So you're right, you can force it by ordering those in the workspace settings.

[SeeminglyScience]

LGTM!