Fix #51597 - move searching with absolute path queries out of search service and into openFileHandler

This reverts commit 27256832 which turns out did not break the import of vs/nls

This reverts commit 7de696a2.

Seems to have broken loading vs/nls in at least one case in insiders

Don't use this import form in places where it is not needed. This prevents us from correctly detecting duplicate imports

Fix exclude settings to be resolved against their root folder, not the searchPath, mainly for './' search scenarios

This reverts commit fb200985.

Exclude input box should take precedence over the settings excludes on folderQuery (not taking into new precedence rules, to be implemented later)

* Fix more Compiler Errors for TS 2.4 in the VSCode codebase

* Fix compile error for 2.3

Tested recomppiling VSCode with TS2.3. This fixes a few issues that were discovered, including workarounds for:

* https://github.com/Microsoft/TypeScript/issues/15184
* https://github.com/Microsoft/TypeScript/issues/15185