chore(login): migrate nextjs login to monorepo (#10134)

# Which Problems Are Solved

We move the login code to the zitadel repo.

# How the Problems Are Solved

The login repo is added to ./login as a git subtree pulled from the
dockerize-ci branch.
Apart from the login code, this PR contains the changes from #10116

# Additional Context

- Closes https://github.com/zitadel/typescript/issues/474
- Also merges #10116  
- Merging is blocked by failing check because of:
- https://github.com/zitadel/zitadel/pull/10134#issuecomment-3012086106

---------

Co-authored-by: Max Peintner <[email protected]>
Co-authored-by: Max Peintner <[email protected]>
Co-authored-by: Florian Forster <[email protected]>

login/.github/dependabot.yml

@@ -0,0 +1,21 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: '/'
+    open-pull-requests-limit: 1
+    schedule:
+      interval: 'daily'
+
+  - package-ecosystem: npm
+    directory: '/'
+    open-pull-requests-limit: 3
+    schedule:
+      interval: daily
+    groups:
+      prod:
+        dependency-type: production
+      dev:
+        dependency-type: development
+    ignore:
+      - dependency-name: "eslint"
+        versions: [ "9.x" ]