Quick fix to correct qualified names to indexed access types

[DanielRosenwasser]

Fixes #17461

[aozgaa]

Not sure you want to make changes to get the fix working in the case mentioned below, but please add a test.

[aozgaa]

This example doesn't seem to trigger the right error, though we can apply the fix manually to fix the issue:

module M {
    export interface I {
         foo: string;
    }
}
let a: M.I.foo;

Please add a test.

[aozgaa]

Looks like there is an analogous entry to this in src/harness/tsconfig.json. Not sure why it's there, or if we might want to remove it. Or alternatively, add a reference to correctQualifiedNameToIndexedAccessType.ts.

@weswigham do you know if building for tests will correctly trigger a rebuild when we make changes to correctQualifiedNameToIndexedAccessType.ts?

[DanielRosenwasser]

@aozgaa no, I didn't generalize the check, but I can at a later point. I did add a negative fourslash test, and augmented the tests added in #17459.