Cannot rename/move directories.

Describe the bug

In windows, the ng language service plugin locks all folder/subfolders of the workspace.

I tracked this lock down with LockHunter.exe: It points to the VSCode subprocess for angular.ng-template.0.901.3\server.

This lock causes renaming directories to fail with: Error: EPERM: operation not permitted, rename '<source>' -> '<target>'

To Reproduce

Steps to reproduce the behavior:

1. Open any angular workspace that has subdirectories
2. Rename/move a directory within that workspace

Expected behavior

Folder renaming should work.

Logs

Not applicable.

Screenshots

If applicable, add screenshots to help explain your problem.

Additional context

Version info:

Angular CLI: 9.1.1
Node: 12.11.1     
OS: win32 x64     

Angular: 9.1.2
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, platform-server
... router
Ivy Workspace: No

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.901.1
@angular-devkit/build-angular     0.901.1
@angular-devkit/build-optimizer   0.901.1
@angular-devkit/build-webpack     0.901.1
@angular-devkit/core              9.1.1
@angular-devkit/schematics        9.1.1
@angular/cdk                      9.2.1
@angular/cli                      9.1.1
@angular/material                 9.2.1
@ngtools/webpack                  9.1.1
@schematics/angular               8.3.25
@schematics/update                0.901.1
rxjs                              6.5.4
typescript                        3.7.5
webpack                           4.42.0

[kyliau]

The non-polling watchers are used to improve performance, but now that there’s built-in option to configure watch mode, we should remove the environment variable.

[atscott]

Re-opening since we have to revert commit 17708d4 to address #1310