[Fleet] Migrating to 8.2 keep old @mappings and @settings component templates

[nchaulet]

Related to #121184

While testing the upgrade from 8.x and 7.x to 8.2 to the new @package. I found that the @package component template is well created, during the upgrade the old and now unused @mappings and @settings templates are kept around. We should delete these old managed component templates.

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[jen-huang]

@joshdover @hop-dev I assume we should delete @mappings in the same way we delete @settings, but welcome your input.

[nchaulet]

@joshdover @hop-dev I assume we should delete @mappings in the same way we delete @settings, but welcome your input.

Actually I do not think we do not delete the @settings neither

[jen-huang]

Actually I do not think we do not delete the @settings neither

Oof, thanks for confirming, I'll update the details here.

[hop-dev]

Thats right we don't clean them up currently, I meant to bring this up in 8.3 planning sorry, I think we want to fix this for 8.2 or we will be leaving a lot of mess behind. @jen-huang @joshdover I know we are quite full for 8.3 but are you happy for me (or someone) to pick this up?

[jen-huang]

@hop-dev Yep, we agreed that this is a fix that should be backported for 8.2.