fix: show job plugin configs by instance

[aledefra]

Summary

• update Job Details plugin selector to list plugin configs by instance instead of deduplicating by signature
• use a unique select key built from signature + instance so multiple CONTAINER_APP_RUNNER entries are selectable
• keep all existing config rendering behavior unchanged

Verification

• npm run lint

[Copilot]

Pull request overview

Updates the Job Details “Plugins” selector to show plugin configurations by plugin instance (rather than deduplicating by signature), allowing multiple configs for the same plugin signature to be selected independently.

Changes:

• Adds a composite selector key derived from signature + instance.
• Updates the select’s selectedKeys / lookup logic to use the composite key.
• Changes plugin config list deduping/sorting to be instance-based.

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