Fixes #38180 - Better names for flatpak rex templates

[sjha4]

What are the changes introduced in this pull request?

Better names for flatpak templates to group them together.

Considerations taken when implementing this change?

As with other templates of similar grouping, use "Flatpak - " to create the grouping.

What are the testing steps for this pull request?

In rails console:
n Rails console: ForemanInternal.all.first.delete
Then run: bundle exec rails db:seed

In Jobs template list, check if the template names are updated and appear in order.

[jeremylenz]

This was annoying me 😅 thanks!

I still seem to have the old templates:

Could write some sort of migration to remove the old locked templates from the database. However, I don't think this will affect users, since it's a new feature. Thoughts?

[sjha4]

Ya..We don't need the migration outside of our dev boxes.. bundle exec rails db:reset..😄