Chore: moves localstorage helper as a shared utility (#6838)

* Chore: moves localstorage helper as a shared utility and refactors constants

* Refactors constants file

* Fixes merge conflicts

* Delete constants.js

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Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/javascript/dashboard/api/testimonials.js

@@ -1,5 +1,5 @@
 /* global axios */
-import wootConstants from 'dashboard/constants';
+import wootConstants from 'dashboard/constants/globals';
 
 export const getTestimonialContent = () => {
   return axios.get(wootConstants.TESTIMONIAL_URL);