Deprecate Iron release

[evan-palmer]

Feature Type

Changing existing functionality in the BlueROV2 driver

Problem Description

ROS 2 Iron is set for EOL at the end of November and will no longer be receiving updates. See the ROS Discourse announcement for further details.

Feature Description

Remove pipelines for ROS 2 Iron and lock the iron branch

Alternative Solutions

n/a

Additional Context

No response