chore: Remove the "Design System Package" term for Uno DSP (backport #695)

[mergify]

Removing the "Design System Package" term for Uno DSP.
Related issue: https://github.com/unoplatform/private/issues/442

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This is an automatic backport of pull request #695 done by Mergify.

[mergify]

Cherry-pick of 6e83206 has failed:

On branch mergify/bp/release/stable/5.2/pr-695
Your branch is up to date with 'origin/release/stable/5.2'.

You are currently cherry-picking commit 6e83206.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   src/Uno.Templates/content/unoapp/.template.config/template.json

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally