fix: update engine naming regex to allow non digit enging (backport #631)

[mergify]

ref: longhorn/longhorn#9267

Before v1.4.x, users might have engine name like "XXXX-e-12avc" or "XXXX-e-abcd1"
We change to use "-0", "-1" starting from v1.4.4, v1.5.2
longhorn/longhorn-manager#2180

The previous regex didn't allow "XXXX-e-12avc" which has non digit ending
We should fix it

---

This is an automatic backport of pull request #631 done by Mergify.

[mergify]

Cherry-pick of 4c2672c has failed:

On branch mergify/bp/v1.7.x/pr-631
Your branch is up to date with 'origin/v1.7.x'.

You are currently cherry-picking commit 4c2672c0.
  (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)

Changes to be committed:
	modified:   vendor/github.com/longhorn/go-common-libs/longhorn/longhorn.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   go.mod
	both modified:   go.sum
	both modified:   vendor/modules.txt

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

[derekbit]

Handled in #632

[ChanYiLin]

Already created manually
#632