Cleanup branched out iron branch (#754)

* Remove unused workflows for iron branch

* Remove repos files from other branches

* Fix semi-binary upstream branches

* fix branch for coverage build

Author: Felix Exner (fexner)

.github/dependabot.yml

@@ -5,10 +5,14 @@ name: Format
 
 on:
   workflow_dispatch:
+    branches:
+      - iron
   pull_request:
+    branches:
+      - iron
   push:
     branches:
-      - main
+      - iron
 
 jobs:
   pre-commit:

.github/mergify.yml

@@ -2,7 +2,7 @@ name: Coverage Build
 on:
   pull_request:
     branches:
-      - main
+      - iron
 
 jobs:
   coverage:
@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
     env:
-      ROS_DISTRO: rolling
+      ROS_DISTRO: iron
       ros_version: 2
     steps:
       - uses: ros-tooling/[email protected]