fix: do not allow total all kind of snapshots to be bigger than 250 (backport #1405)

[mergify]

longhorn/longhorn#10308

Special notes for your reviewer:

The dependent PR is at longhorn/types#45

Additional documentation or context

This PR is an alternative proposal to the PR #1404. Why?

1. This PR will fix the total snapshot count issue
2. It still keeping the previous behavior of the snapshot enforcement feature the same. A.K.A the following case still work:
   1. User create a volume with backing image
   2. User set maximum snapshot count for the volume to be 2
   3. Longhorn allows user to take 2 more snapshot. If we use the PR fix: not allow more than 250 snapshots including all kind of snapshots #1404, Longhorn would not allow user to take any more snapshot which might be a behavior change, or confusion, or regression

---

This is an automatic backport of pull request #1405 done by [Mergify](https://mergify.com).

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[derekbit]

After discussing with @innobead, no need to backport to v1.7.x because of

• low severity (3)
• longhorn/types has breaking change