using relative values instead of absolute values for the font size and the line height (#286006)

* using relative values instead of absolute values for the font size and the line height

* renaming to multiplier

* setting back to font size and line height

* Revert "renaming to multiplier"

This reverts commit 558885565989c3aa702cc58f9a83c2c95a9e6067.

* doing some polishing work

* changing the api

* updating to higher version of vscode-textmate

* also changing the vscode textmate package version for the remote extension

* increasing the vscode textmate version in remote/web

* updating package lock json

* using css variables instead of fetching font size from config service

* removing the second multiplier event

* adding ? after dom element style

* Ensure dots from floating fontSize are stripped from class names

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Co-authored-by: Alexandru Dima <[email protected]>