ESLint upgrade, implement additional rules (#3230)

* upgrade to ESLintv7, added overrides for rules violated
* removed overrides for spec files
* fixed no-prototype-builtins issues
* added rules for default-case-last, default-param-last, grouped-accessor-pairs, no-constructor-return, and added override for one violation

Co-authored-by: Andrew Henry <akhenry@gmail.com>
Co-authored-by: Shefali Joshi <simplyrender@gmail.com>

src/plugins/notebook/snapshot-container.js

@@ -14,6 +14,7 @@ export default class SnapshotContainer extends EventEmitter {
 
         this.openmct = openmct;
 
+        // eslint-disable-next-line
         return SnapshotContainer.instance;
     }