[Feature][linkis-entrance] When determining the maxRunningJob on creating a group, offlined entrance nodes should be excluded.

[Alexkun]

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• I had searched in the issues and found no similar feature requirement.

Problem Description

When determining the maxRunningJob on creating a group, offlined entrance nodes are included at present.

Description

1. when determining the maxRunningJob on creating a group, the entrance gets all entrance node num, then minus the offline entrance num.
2. provide a new RPC method 'getInstanceNumByLabels', which will return the num of nodes with specific labels.

Use case

No response

Solutions

No response

Anything else

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Are you willing to submit a PR?

• Yes I am willing to submit a PR!

[github-actions]

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