chore(alert): remove old non-CSFv3 alert stories

[kevinbuhmann]

These are not needed after faf161a (#1103).

CDE-1519

[github-actions]

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[github-actions]

This PR introduces visual changes: fd39849
If these changes are intended and correct, please cherry-pick the above commit to this PR.

git checkout kevin/old-alert-stories
git fetch https://github.com/vmware-clarity/ng-clarity.git fd39849544bac302895bb6f28151bb15f44153b3
git cherry-pick fd39849544bac302895bb6f28151bb15f44153b3
git push

[valentin-mladenov]

LGTM

[github-actions]

Hi there 👋, this is an automated message. To help Clarity keep track of discussions, we automatically lock closed PRs after 14 days. Please look for another open issue or open a new issue with updated details and reference this one as necessary.