chore: Remove path aliases - the fun parts

[ecraig12345]

This is the interesting part of removing aliases: update all the configs and deal with the few challenging special cases. (Temporarily targeted into a combo branch of #2218 and #2243.)

Alias strategy:

• A few doc-related files in build/gulp/plugins/util import from docs/src/types. For now, add a file in that directory which re-exports the types (imported by relative path) and update all imports to be from that file. Eventually the types should move to a shared location.
• Replace docs imports in perf and perf-test with deps on @fluentui/docs
• Replace build alias with relative paths