[UI][FEATURE] Longhorn snapshot space management

[github-actions]

make corresponding UI changes for #6563

cc @longhorn/dev-ui

1. Add Snapshot Max Count and Snapshot Max Size to creating volume page. Default value is 0 for snapshotMaxCount and "0" for snapshotMaxSize. We have a webhook to update snapshotMaxCount to global setting value if snapshotMaxCount == 0.

2. Add `Update Snapshot Max Count` and `Update Snapshot Max Size` to volume action list.

3. Add Snapshot Max Count setting to snapshot setting block. Default value can be get from snapshot-max-count setting.

[longhorn-io-github-bot]

Pre Ready-For-Testing Checklist

• Where is the reproduce steps/test steps documented?
  The reproduce steps/test steps are at:

• Is there a workaround for the issue? If so, where is it documented?
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• Does the PR include the explanation for the fix or the feature?

• Does the PR include deployment change (YAML/Chart)? If so, where are the PRs for both YAML file and Chart?
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  The PR for the chart change is at:

• Have the backend code been merged (Manager, Engine, Instance Manager, BackupStore etc) (including backport-needed/*)?
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• Which areas/issues this PR might have potential impacts on?
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  Issues

• If labeled: require/LEP Has the Longhorn Enhancement Proposal PR submitted?
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• If labeled: require/doc Has the necessary document PR submitted or merged (including backport-needed/*)?
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• If the fix introduces the code for backward compatibility Has a separate issue been filed with the label release/obsolete-compatibility?
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[yangchiu]

@FrankYang0529

Tested on master-head (longhorn-ui f865934). I create a volume with snapshot max size = 2.2 Gi via UI, and tried to update it via UI, but the value displayed in the update dialog is 2.2000000001862645 Gi instead of 2.2 Gi:

Is it acceptable?

[scures]

@yangchiu longhorn/longhorn-ui#688 should fix that.

[FrankYang0529]

It looks like size also has same issue. We can keep both having same behavior.

[scures]

I sent a commit for that modal too :)

[yangchiu]

Verified passed on master-head (longhorn-ui 418c7d6) and v1.6.x-head (longhorn-ui 63e29e8) following the test plan.