Apply disableReferencedProjectLoad to getOriginalLocationEnsuringConfiguredProject

[amcasey]

disableReferencedProjectLoad was intended to prevent project loading during find-all-references (FAR), as an escape valve for teams with very large solutions. However, there's a case it doesn't cover - when the declaration is actually in another project but was pulled into the open project by project reference redirects, the "default" configured project containing the declaring file will be loaded, possibly causing a long delay or an OOM crash.

Note that, while we don't want to load the declaring project, we do want to search it if it's already open.

There's also a weird corner case where disableSourceOfProjectReferenceRedirect is enabled, but a .d.ts.map file exists, which causes the .ts file from the referenced project to be discovered anyway. When this happens, we use the .ts file if it's in some open project and the .d.ts file (which is definitely in an open project, or we wouldn't have found it) otherwise.

[amcasey]

I'm still working on tests, but I believe the product code is ready for buddy testing.
cc @DanielRosenwasser

[amcasey]

If you look at the diff for the fourth commit, you can see the comments flagging the baselines affected by this change.

[andrewbranch]

Thanks for the IRL refresher on what all these options mean!