Icu 6800 api is secret data modeling (#1448)

* refactor: 💡 Add isSecret option for model attributes

Move secret attribute logic to application serializer that will remove
the key/value pair if the value is null or empty

✅ Closes: ICU-6800

* refactor: 💡 Add isSecret option to credential store token

* Update addons/api/addon/serializers/credential.js

Remove unneeded serialize method for credentials

Co-authored-by: Randall Morey <randall@randallmorey.com>

* refactor: 💡 add type check for serializing secret attributes

Co-authored-by: Randall Morey <randall@randallmorey.com>

addons/api/addon/generated/models/credential-store.js

@@ -82,6 +82,7 @@ export default class GeneratedCredentialStoreModel extends BaseModel {
   @attr('string', {
     for: 'vault',
     isNestedAttribute: true,
+    isSecret: true,
     description: 'A token used for accessing Vault.',
   })
   token;

addons/api/addon/generated/models/credential.js

@@ -58,6 +58,7 @@ export default class GeneratedCredentialModel extends BaseModel {
   @attr('string', {
     for: 'username_password',
     isNestedAttribute: true,
+    isSecret: true,
     description: 'The password for credential.',
   })
   password;
@@ -66,6 +67,7 @@ export default class GeneratedCredentialModel extends BaseModel {
   @attr('string', {
     for: 'ssh_private_key',
     isNestedAttribute: true,
+    isSecret: true,
     description: 'The private key for credential.',
   })
   private_key;
@@ -73,6 +75,7 @@ export default class GeneratedCredentialModel extends BaseModel {
   @attr('string', {
     for: 'ssh_private_key',
     isNestedAttribute: true,
+    isSecret: true,
     description: 'The private key passphrase for credential.',
   })
   private_key_passphrase;