Add Northflank connection support

- Introduced Northflank as a new app connection option, including API token authentication.
- Implemented connection schemas, validation, and service functions for Northflank.
- Updated API documentation to include Northflank endpoints and integration instructions.
- Added frontend components for creating and managing Northflank connections.

docs/api-reference/endpoints/app-connections/northflank/available.mdx

@@ -0,0 +1,4 @@
+---
+title: "Available"
+openapi: "GET /api/v1/app-connections/northflank/available"
+---

docs/api-reference/endpoints/app-connections/northflank/create.mdx

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+---
+title: "Create"
+openapi: "POST /api/v1/app-connections/northflank"
+---
+
+<Note>
+    Check out the configuration docs for [Northflank Connections](/integrations/app-connections/northflank) to learn how to obtain the required credentials.
+</Note>

docs/api-reference/endpoints/app-connections/northflank/delete.mdx

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+---
+title: "Delete"
+openapi: "DELETE /api/v1/app-connections/northflank/{connectionId}"
+---

docs/api-reference/endpoints/app-connections/northflank/get-by-id.mdx

@@ -0,0 +1,4 @@
+---
+title: "Get by ID"
+openapi: "GET /api/v1/app-connections/northflank/{connectionId}"
+---

docs/api-reference/endpoints/app-connections/northflank/get-by-name.mdx

@@ -0,0 +1,4 @@
+---
+title: "Get by Name"
+openapi: "GET /api/v1/app-connections/northflank/connection-name/{connectionName}"
+---

docs/api-reference/endpoints/app-connections/northflank/list.mdx

@@ -0,0 +1,4 @@
+---
+title: "List"
+openapi: "GET /api/v1/app-connections/northflank"
+---

docs/api-reference/endpoints/app-connections/northflank/update.mdx

@@ -0,0 +1,4 @@
+---
+title: "Update"
+openapi: "PATCH /api/v1/app-connections/northflank/{connectionId}"
+---