[WIP] [MM-55031] OAuth Outgoing Connection App integration (#25379)

* OAuthOutgoingConnection model

* added store

* make generated

* add missing license headers

* fix receiver name

* i18n

* i18n sorting

* update migrations from master

* make migrations-extract

* update retrylayer tests

* replaced sql query with id pagination

* fixed flaky tests

* missing columns

* missing columns on save/update

* typo

* improved tests

* remove enum from mysql colum

* add password credentials to store

* license changes

* OAuthOutgoingConnectionInterface

* Oauth -> OAuth

* make generated

* merge migrations

* renamed migrations

* model change suggestions

* refactor test functionsn

* migration typo

* refactor store table names

* updated sanitize test

* cleanup merge

* refactor symbol

* list endpoint

* oauthoutgoingconnection -> outgoingoauthconnection

* signature change

* i18n update

* granttype typo

* naming

* api list

* uppercase typo

* i18n

* missing license header

* fixed path in comments

* updated openapi definitions

* sanitize connections

* make generated

* test license and no feature flag

* removed t.fatal

* updated testhelper calls

* yaml schema fixes

* switched interface name

* suggested translation

* missing i18n translation

* address comments

* updated i18n

api/v4/source/definitions.yaml

@@ -3580,6 +3580,30 @@ components:
           description: The number of active users in the server
           type: integer
           format: int64
+  # Outgoing OAuth Connections
+    OutgoingOAuthConnectionGetItem:
+      type: object
+      properties:
+        id:
+          description: The unique identifier for the outgoing OAuth connection.
+          type: string
+        name:
+          description: The name of the outgoing OAuth connection.
+          type: string
+        create_at:
+          description: The time in milliseconds the outgoing OAuth connection was created.
+          type: integer
+          format: int64
+        update_at:
+          description: The time in milliseconds the outgoing OAuth connection was last updated.
+          type: integer
+          format: int64
+        grant_type:
+          description: The grant type of the outgoing OAuth connection.
+          type: string
+        audiences:
+          description: The audiences of the outgoing OAuth connection.
+          type: string
 externalDocs:
   description: Find out more about Mattermost
   url: 'https://about.mattermost.com'

api/v4/source/outgoing_oauth_connections.yaml

@@ -0,0 +1,52 @@
+  /api/v4/oauth/outgoing_connections:
+    get:
+      tags:
+        - oauth
+        - outgoing_connections
+        - outgoing_oauth_connections
+      summary: List all connections
+      description: >
+        List all outgoing OAuth connections.
+
+        __Minimum server version__: 9.5
+      operationId: ListOutgoingOAuthConnections
+      responses:
+        "200":
+          description: Successfully fetched outgoing OAuth connections
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/OutgoingOAuthConnectionGetItem"
+        "401":
+          $ref: "#/components/responses/Unauthorized"
+        "500":
+          $ref: "#/components/responses/InternalServerError"
+        "501":
+          $ref: "#/components/responses/NotImplemented"
+  /api/v4/oauth/outgoing_connections/{connection_id}:
+    get:
+      tags:
+        - oauth
+        - outgoing_connections
+        - outgoing_oauth_connections
+      summary: Get a connection
+      description: >
+        Retrieve an outgoing OAuth connection.
+
+        __Minimum server version__: 9.5
+      operationId: GetOutgoingOAuthConnection
+      responses:
+        "200":
+          description: Successfully fetched outgoing OAuth connection
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/OutgoingOAuthConnectionGetItem"
+        "401":
+          $ref: "#/components/responses/Unauthorized"
+        "500":
+          $ref: "#/components/responses/InternalServerError"
+        "501":
+          $ref: "#/components/responses/NotImplemented"