reef: mgr/prometheus: fix orch check to prevent Prometheus crash

[rkachach]

https://tracker.ceph.com/issues/64339

Backport of #55149

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[rkachach]

jenkins test rook e2e

[avanthakkar]

LGTM

[avanthakkar]

Btw backport of seems like another PR , shouldn't it be #55149 ?

[rkachach]

Btw backport of seems like another PR , shouldn't it be #55149 ?

Yep, that's right. I fixed the link 👍