Update dev package dependencies

[mattmasson]

Resolves many npm package dependency issues.

There are still some warnings about deprecated packages (eslint and babel) under the webviews directory. These are tracked by #295

[albertli-msft]

One last thing 😬, let's bump the node version used in the pl yml as well:

.github/workflows/pr-gated.yml
L16: node-version: "16.14" -> node-version: "18.19"

.pipelines/pr-pipeline.yml
L20: versionSpec: "16.x" -> versionSpec: "18.x"

.github/workflows/rc.yml
L57: node-version: "16.14" -> node-version: "18.19"

[albertli-msft]

ahhhh, we forgot the pl ymls

[mattmasson]

I noticed that changing node versions and the version of vscode-extension-tester would typically cause test:e2e to fail with an error like:

"This version of \test-resources\VSCode-win32-x64-archive\Code.exe is not compatible with the version of Windows you're running. Check your computer's system information and then contact the software publisher."

Deleting the files under the test-resources path seemed to resolve the issue.