mgr/dashboard: cephfs subvolume remove

[nizamial09]

Fixes: https://tracker.ceph.com/issues/62349

scrnli_8_8_2023_10-40-19.AM.mp4

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[cloudbehl]

Tested the PR, looks good to me.

Nit: Change the Delete button to call it Remove.

Screencast.from.2023-08-08.13-13-40.webm

[nizamial09]

Change the Delete button to call it Remove.

Thanks @cloudbehl! Done

[Pegonzal]

LGTM as well!

[github-actions]

This pull request can no longer be automatically merged: a rebase is needed and changes have to be manually resolved

[aaSharma14]

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