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/workflows/issues.yml

@@ -0,0 +1,41 @@
+name: Add new issues to product management project
+
+on:
+  issues:
+    types:
+      - opened
+
+jobs:
+  add-to-project:
+    name: Add issue and community pr to project
+    runs-on: ubuntu-latest
+    if: github.repository_id == '622995060'
+    steps:
+      - name: add issue
+        uses: actions/[email protected]
+        if: ${{ github.event_name == 'issues' }}
+        with:
+          # You can target a repository in a different organization
+          # to the issue
+          project-url: https://github.com/orgs/zitadel/projects/2
+          github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}
+      - uses: tspascoal/get-user-teams-membership@v3
+        id: checkUserMember
+        if: github.actor != 'dependabot[bot]'
+        with:
+         username: ${{ github.actor }}
+         GITHUB_TOKEN: ${{ secrets.ADD_TO_PROJECT_PAT }}
+      - name: add pr
+        uses: actions/[email protected]
+        if: ${{ github.event_name == 'pull_request_target' && github.actor != 'dependabot[bot]' && !contains(steps.checkUserMember.outputs.teams, 'engineers')}}
+        with:
+          # You can target a repository in a different organization
+          # to the issue
+          project-url: https://github.com/orgs/zitadel/projects/2
+          github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}
+      - uses: actions-ecosystem/[email protected]
+        if: ${{ github.event_name == 'pull_request_target' && github.actor != 'dependabot[bot]' && !contains(steps.checkUserMember.outputs.teams, 'staff')}}
+        with:
+          github_token: ${{ secrets.ADD_TO_PROJECT_PAT }}
+          labels: |
+            os-contribution