security: add explicit permissions to integration test workflows

Add minimal required permissions to address security alerts:

.github/workflows/workflow-tests.yml:
- contents: read (to read repository content)
- pull-requests: write (updater creates/updates PRs)
- issues: write (PRs are issues under the hood)

.github/workflows/danger-workflow-tests.yml:
- contents: read (to read repository content)
- pull-requests: read (danger reads PR details)
- issues: write (danger posts comments on PRs)

This follows the principle of least privilege by explicitly limiting
GITHUB_TOKEN permissions instead of using the broad default permissions.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: vaind

.github/workflows/danger-workflow-tests.yml

@@ -5,6 +5,11 @@ on:
   pull_request:
     types: [opened, synchronize, reopened, edited, ready_for_review]
 
+permissions:
+  contents: read
+  pull-requests: read
+  issues: write
+
 jobs:
   danger:
     runs-on: ubuntu-latest

.github/workflows/workflow-tests.yml

@@ -4,6 +4,11 @@ name: Workflow Tests
 on:
   push:
 
+permissions:
+  contents: read
+  pull-requests: write
+  issues: write
+
 jobs:
   updater-create-pr:
     runs-on: ubuntu-latest