feat: remove default backup target settings (backport #3414)

[mergify]

Which issue(s) this PR fixes:

Issue longhorn/longhorn#10043

What this PR does / why we need it:

Special notes for your reviewer:

Additional documentation or context

---

This is an automatic backport of pull request #3414 done by [Mergify](https://mergify.com).

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[derekbit]

LGTM