feat: 🎸 create form for json credentials (#1498)

* feat: 🎸 create form for json credentials

✅ Closes: ICU-6682

* refactor: 💡 add new info field

* refactor: 💡 add feature flag

* refactor: 💡 add hds radio cards to json cred

* Update ui/admin/tests/acceptance/credential-store/credentials/create-test.js

* test: 💍 add test for json cred

* chore: 🤖 Remove ember-data-model-fragments package

* fix: 🐛 Update how json is added as a known credential type

* refactor: 💡 update credentialTypes if statement to ternary

* chore: 🤖 add ember-data back to addon/api project

* chore: 🤖 remove ember-feature-flag from addon/api

* refactor: 💡 remove if statement in cred form

* refactor: 💡 update selectors for json cred. tests

* refactor: 💡 Update Credential Form to use form.disabled

* test: 💍 Fix test selectors for radio card credential tests

* refactor: 💡 update credential types declaration to const

* style: 💄 Fix style issue with SecretEditor in edit mode

* refactor: 💡 remove disabled and readonly attributes in form

* refactor: 💡 Create credential ability canRead override

* test: 💍 add credential ability override tests

* test: 💍 Fix brokered credential test with json support added

* refactor: 💡 add attributes comment back to credential model

Co-authored-by: Cameron Perera <cameron.perera@hashicorp.com>

ui/admin/app/styles/app.scss

@@ -508,21 +508,18 @@
   border-radius: sizing.rems(xxs);
   height: var(--secret-editor-height);
   margin-bottom: sizing.rems(l);
+  width: 100%;
 
   .secret-editor-json {
     .CodeMirror {
       border-radius: sizing.rems(xxs);
       height: var(--secret-editor-height);
+      display: block;
     }
 
     .CodeMirror-gutters {
       background: var(--secret-editor-gutter);
     }
-
-    // override CodeMirror padding to add padding to left of line numbers
-    .CodeMirror-linenumber {
-      padding: 0;
-    }
   }
 
   .secret-editor-skeleton-wrapper {