[bug][CGS][engineconn] Fix NPE when updating metrics during engine creation and reuse

[aiceflower]

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

Linkis Component

• linkis-commons
• linkis-computation-governance
• linkis-dist
• linkis-engineconn-plugin
• linkis-extensions
• linkis-orchestrator
• linkis-public-enhancements
• linkis-spring-cloud-services
• linkis-web

Description

Null pointer exception occurs when updating metrics during engine creation and reuse.

Steps to reproduce

1. Create or reuse an engineconn
2. Metrics update is triggered
3. NPE occurs when metrics object is null

Expected behavior

Should handle null metrics gracefully without throwing NPE.

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

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