fix(workflow): expose referenced plugin inputs as variables

[huanghongbo-hhb]

Summary

• Expose plugin inputs referenced by dynamic variable functions.

Why

• A function could use job.<job-name>.<input-name>, but the referenced input was absent from the available-variable list.

Main Changes

• Parse plugin input CallFunction references with the existing variable parser.
• Return only referenced inputs from the same plugin job; exclude repo/file inputs.

Risk / Compatibility

• Additive and scoped to existing function references; unrelated plugin inputs remain hidden.

Test

• Verified referenced inputs are returned, unrelated inputs are omitted, and the Job controller package compiles.
  Contact: huanghongbo@koderover.com

---

This change is