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

templates/repo/issue/view_content/comments_delete_time.tmpl

@@ -13,7 +13,7 @@
 					</div>
 				</div>
 				<button class="ui icon button compact mini issue-delete-time poping up" data-id="{{.comment.Time.ID}}" data-content="{{.ctx.i18n.Tr "repo.issues.del_time"}}" data-position="top right" data-variation="tiny inverted">
-					{{svg "octicon-trashcan"}}
+					{{svg "octicon-trash"}}
 				</button>
 			</span>
 		{{end}}