Remove @microsoft/applicationinsights-web dependency

• Also replace WebAppInsightsAppender with NullAppender

How to test?

You can update the vscode_version.json of the gitlab-web-ide project to use the build artifact from this MR.

diff --git a/packages/vscode-build/vscode_version.json b/packages/vscode-build/vscode_version.json
index 2d8b458..bacfd79 100644
--- a/packages/vscode-build/vscode_version.json
+++ b/packages/vscode-build/vscode_version.json
@@ -1,5 +1,5 @@
 {
   "type": "url",
-  "location": "https://gitlab.com/gitlab-org/gitlab-web-ide-vscode-fork/-/package_files/47251282/download",
-  "version": "1.69.1-1.0.0-dev-20220725055226"
+  "location": "https://gitlab.com/gitlab-org/gitlab-web-ide-vscode-fork/-/jobs/2945469975/artifacts/raw/.build/vscode-web-dist/vscode-web-1.69.1-1.0.0-dev-20220829034959.tar.gz",
+  "version": "1.69.1-1.0.0-dev-20220829034959"
 }

Screenshots

This results in about 50M of uncompressed package size reduction (203M vs. 155M), which ends up being about 7M of compressed package size reduction.

When hooking this MR's build artifact into the web-ide, it looks like everything still works and will save more than 10M of uncompressed package size 👍

Context

gitlab-web-ide!51 (closed)