fix(testing): validate generated workflow job names

[huanghongbo-hhb]

Summary:

• validate testing and scanning module names before create/update so they can generate valid workflow job names
• move generated workflow job name helpers into core/common/util for reuse
• reuse the same helpers when generating standalone testing/scanning workflows to keep behavior consistent

Background:
Testing and scanning modules could previously be created with names that were valid in the UI but invalid after being transformed into workflow job names. This caused standalone execution to fail later during workflow linting with job-name validation errors.

Verification:

• /usr/local/go/bin/go test -vet=off ./pkg/microservice/aslan/core/workflow/testing/service ./pkg/microservice/aslan/core/common/util

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This change is