fix(workflow): use product envs in task filters

[huanghongbo-hhb]

Summary

• change workflow task env filter options to read envs from the product collection instead of workflow task history
• determine the target env type from the workflow job config and use it to list current project envs from product
• return env alias when present and fall back to env name otherwise

Background

The workflow execution record page calls GET /api/aslan/workflow/v4/workflowtask/filter/workflow/:name?queryType=envName&jobName=... to fetch env filter options. The correct data source for the env list is the product collection rather than workflow task history. This change aligns the filter options with the current env list stored in product.

Verification

• /usr/local/go/bin/go build ./pkg/microservice/aslan/core/workflow/service/workflow
• /usr/local/go/bin/go test -vet=off ./pkg/microservice/aslan/core/workflow/service/workflow
• note: plain go test still hits pre-existing vet issues in this package unrelated to this change

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This change is