Add scheduled builds to iron branch

Since the iron branch is now the default branch, we need to run scheduled builds off that.

.github/mergify.yml

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+pull_request_rules:
+  - name: Backport to humble branch
+    conditions:
+      - base=iron
+      - label=backport-humble
+    actions:
+      backport:
+        branches:
+          - humble
+        labels:
+          - humble

.github/workflows/humble-binary-main.yml

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+name: Humble Binary Main
+on:
+  workflow_dispatch:
+    branches:
+      - humble
+  pull_request:
+    branches:
+      - humble
+  push:
+    branches:
+      - humble
+  schedule:
+    - cron: '13 4 * * *'
+
+jobs:
+  binary:
+    uses: ./.github/workflows/reusable_ici.yml
+    with:
+      ros_distro: humble
+      ros_repo: main
+      ref_for_scheduled_build: humble

.github/workflows/humble-binary-testing.yml

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+name: Humble Binary Testing
+on:
+  workflow_dispatch:
+    branches:
+      - humble
+  pull_request:
+    branches:
+      - humble
+  push:
+    branches:
+      - humble
+  schedule:
+    - cron: '13 4 * * *'
+
+jobs:
+  binary:
+    uses: ./.github/workflows/reusable_ici.yml
+    with:
+      ros_distro: humble
+      ros_repo: testing
+      ref_for_scheduled_build: humble

.github/workflows/humble-semi-binary-main.yml

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+name: Humble Semi Binary Main
+on:
+  workflow_dispatch:
+    branches:
+      - humble
+  pull_request:
+    branches:
+      - humble
+  push:
+    branches:
+      - humble
+  schedule:
+    - cron: '13 4 * * *'
+
+jobs:
+  binary:
+    uses: ./.github/workflows/reusable_ici.yml
+    with:
+      ros_distro: humble
+      ros_repo: main
+      ref_for_scheduled_build: humble
+      upstream_workspace: Universal_Robots_ROS2_Gazebo_Simulation.humble.repos

.github/workflows/humble-semi-binary-testing.yml

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+name: Humble Semi Binary Testing
+on:
+  workflow_dispatch:
+    branches:
+      - humble
+  pull_request:
+    branches:
+      - humble
+  push:
+    branches:
+      - humble
+  schedule:
+    - cron: '13 4 * * *'
+
+jobs:
+  binary:
+    uses: ./.github/workflows/reusable_ici.yml
+    with:
+      ros_distro: humble
+      ros_repo: testing
+      ref_for_scheduled_build: humble
+      upstream_workspace: Universal_Robots_ROS2_Gazebo_Simulation.humble.repos

Universal_Robots_ROS2_Gazebo_Simulation.humble.repos

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+repositories:
+  ur_description:
+    type: git
+    url: https://github.com/UniversalRobots/Universal_Robots_ROS2_Description
+    version: humble
+
+  gazebo_ros2_control:
+    type: git
+    url: https://github.com/ros-simulation/gazebo_ros2_control.git
+    version: humble
+
+  moveit2:
+    type: git
+    url: https://github.com/ros-planning/moveit2.git
+    version: humble
+
+  moveit_msgs:
+    type: git
+    url: https://github.com/ros-planning/moveit_msgs.git
+    version: humble
+
+  ros2_control:
+    type: git
+    url: https://github.com/ros-controls/ros2_control.git
+    version: humble
+
+  ros2_controllers:
+    type: git
+    url: https://github.com/ros-controls/ros2_controllers.git
+    version: humble