Update JS dependencies (#15033)

* Update JS dependencies

- Update all JS dependencies
- For octicons, rename trashcan to trash
- For svgo, migrate to v2 api, output seems to have slightly changed but icons look the same
- For stylelint, update config, fix custom property duplicates
- For monaco, drop legacy Edge support
- For eslint, enable new rules, fix new issues
- For less-loader, remove deprecated import syntax

* update svgo usage in generate-images and rebuild logo.svg with it

public/img/svg/octicon-key.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-key" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M6.5 5.5a4 4 0 112.731 3.795.75.75 0 00-.768.18L7.44 10.5H6.25a.75.75 0 00-.75.75v1.19l-.06.06H4.25a.75.75 0 00-.75.75v1.19l-.06.06H1.75a.25.25 0 01-.25-.25v-1.69l5.024-5.023a.75.75 0 00.181-.768A3.995 3.995 0 016.5 5.5zm4-5.5a5.5 5.5 0 00-5.348 6.788L.22 11.72a.75.75 0 00-.22.53v2C0 15.216.784 16 1.75 16h2a.75.75 0 00.53-.22l.5-.5a.75.75 0 00.22-.53V14h.75a.75.75 0 00.53-.22l.5-.5a.75.75 0 00.22-.53V12h.75a.75.75 0 00.53-.22l.932-.932A5.5 5.5 0 1010.5 0zm.5 6a1 1 0 100-2 1 1 0 000 2z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-key" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M6.5 5.5a4 4 0 1 1 2.731 3.795.75.75 0 0 0-.768.18L7.44 10.5H6.25a.75.75 0 0 0-.75.75v1.19l-.06.06H4.25a.75.75 0 0 0-.75.75v1.19l-.06.06H1.75a.25.25 0 0 1-.25-.25v-1.69l5.024-5.023a.75.75 0 0 0 .181-.768A3.995 3.995 0 0 1 6.5 5.5zm4-5.5a5.5 5.5 0 0 0-5.348 6.788L.22 11.72a.75.75 0 0 0-.22.53v2C0 15.216.784 16 1.75 16h2a.75.75 0 0 0 .53-.22l.5-.5a.75.75 0 0 0 .22-.53V14h.75a.75.75 0 0 0 .53-.22l.5-.5a.75.75 0 0 0 .22-.53V12h.75a.75.75 0 0 0 .53-.22l.932-.932A5.5 5.5 0 1 0 10.5 0zm.5 6a1 1 0 1 0 0-2 1 1 0 0 0 0 2z"/></svg>