micro_ros_agent installation issue on ROS 2 Humble Ubuntu 22.04

## Issue template

- Hardware description: PC, Ubuntu 22.04
- RTOS: Ardupilot SITL
- Installation type: micro_ros_setup
- Version or commit hash: humble

#### Steps to reproduce the issue

Follow [First micro-ROS Application on Linux](https://micro.ros.org/docs/tutorials/core/first_application_linux/). When creating and building the micro-ROS agent

```
ros2 run micro_ros_setup create_agent_ws.sh
ros2 run micro_ros_setup build_agent.sh
```
I run into the following error:
```
stderr: micro_ros_agent
CMake Error at /opt/ros/humble/share/fastrtps/cmake/fastrtps-dynamic-targets.cmake:37 (message):
Some (but not all) targets in this export set were already defined.

Targets Defined: eProsima_atomic

Targets not yet defined: fastrtps

Call Stack (most recent call first):
/opt/ros/humble/share/fastrtps/cmake/fastrtps-config.cmake:60 (include)
CMakeLists.txt:37 (find_package)
```

#### Expected behavior

micro-ROS agent installation works as expected and I can use it for working with Ardupilot.

#### Actual behavior

```
stderr: micro_ros_agent
CMake Error at /opt/ros/humble/share/fastrtps/cmake/fastrtps-dynamic-targets.cmake:37 (message):
Some (but not all) targets in this export set were already defined.

Targets Defined: eProsima_atomic

Targets not yet defined: fastrtps

Call Stack (most recent call first):
/opt/ros/humble/share/fastrtps/cmake/fastrtps-config.cmake:60 (include)
CMakeLists.txt:37 (find_package)
```

#### Additional information

Installing Fast-DDS from source didn't fix the issue for me either

Reproduce the failure with create_agent_ws.sh and build_agent.sh on Ubuntu 22.04 with ROS 2 Humble. Inspect CMakeLists.txt at the find_package call and the referenced fastrtps CMake configuration, using the reported target definitions as the starting point. Done means the micro-ROS agent workspace builds successfully and the agent can be run.

Written by the indexing model from the issue text.