Move browser event utils from utils.js to browser_events.js (#5464)

* fix: move browser event utils to browserEvents

* fix: mark browser event utils in utils as deprecated

* fix: move uses of browser event funcs to browserEvents

* fix: remove browserEvents definition of noEvent

* fix: add renames for browser event utils

* docs: add suggested alternatives for browser event utils

* fix: change deprecations to stubs

* fix: PR comments

scripts/migration/renamings.js

@@ -117,6 +117,10 @@ const renamings = {
     'Blockly.utils': {
       exports: {
         genUid: {module: 'Blockly.utils.idGenerator'},
+        getScrollDelta: {module: 'Blockly.utils.browserEvents'},
+        isTargetInput: {module: 'Blockly.utils.browserEvents'},
+        isRightButton: {module: 'Blockly.utils.browserEvents'},
+        mouseToSvg: {module: 'Blockly.utils.browserEvents'},
       },
     },
     'Blockly.utils.global': {