Release/changelog line length can be too long when converted from rst snippets

i think we dont enforce line lenght on rst, and now that changelog snippets are rst, the lines can be too long when they are converted to yaml

one option would be to, do line mangling when converting, but that is inherently risk with rst

probably the better option is to just add some ci to ensure changelog rst snippets are not too long

Trace how changelog RST snippets are converted to YAML and inspect the existing CI checks for a suitable validation point. Done means CI identifies changelog snippets whose converted lines would be too long, without performing risky RST line mangling.

Written by the indexing model from the issue text.