[EC-423] Fix unit tests (#3265)

* Create base jest.config file

* Fix various tests that were broken

* Add maxWorkers to jest config

* Undo change to testEnvironment

* Enable tsconfig.spec.json

libs/components/src/button/button.directive.ts

@@ -61,11 +61,11 @@ export class ButtonDirective {
       "focus:tw-z-10",
     ]
       .concat(this.block ? ["tw-w-full", "tw-block"] : ["tw-inline-block"])
-      .concat(buttonStyles[this.buttonType] ?? []);
+      .concat(buttonStyles[this.buttonType ?? "secondary"]);
   }
 
   @Input()
-  buttonType: ButtonTypes = "secondary";
+  buttonType: ButtonTypes = null;
 
   @Input()
   block = false;