Improve linear app (#20453)

- Add front component form to create linear issue
<img width="1512" height="831" alt="image"
src="https://github.com/user-attachments/assets/ffbb223f-30a8-4c64-ac6d-002c29b604c1"
/>
<img width="1512" height="829" alt="image"
src="https://github.com/user-attachments/assets/a5ed2464-35a9-4a60-804c-5f15eb0043b4"
/>

- improve marketplace Linear app page
<img width="1302" height="834" alt="image"
src="https://github.com/user-attachments/assets/cdec7ec2-953d-4a49-a797-5369834b03c1"
/>


- update admin settings to display non secret values
<img width="861" height="473" alt="image"
src="https://github.com/user-attachments/assets/41dadf02-aa5d-4eb6-befe-0ad8ad4049b2"
/>

packages/twenty-client-sdk/src/metadata/generated/schema.graphql

@@ -1967,6 +1967,18 @@ type RotateClientSecret {
   clientSecret: String!
 }
 
+type ApplicationRegistrationVariableDTO {
+  id: UUID!
+  key: String!
+  value: String
+  description: String!
+  isSecret: Boolean!
+  isRequired: Boolean!
+  isFilled: Boolean!
+  createdAt: DateTime!
+  updatedAt: DateTime!
+}
+
 type Relation {
   type: RelationType!
   sourceObjectMetadata: Object!
@@ -3034,7 +3046,7 @@ type Query {
   findManyApplicationRegistrations: [ApplicationRegistration!]!
   findOneApplicationRegistration(id: String!): ApplicationRegistration!
   findApplicationRegistrationStats(id: String!): ApplicationRegistrationStats!
-  findApplicationRegistrationVariables(applicationRegistrationId: String!): [ApplicationRegistrationVariable!]!
+  findApplicationRegistrationVariables(applicationRegistrationId: String!): [ApplicationRegistrationVariableDTO!]!
   applicationRegistrationTarballUrl(id: String!): String
   currentUser: User!
   currentWorkspace: Workspace!