fix: add deployment boolean to job-environment-mapping schema (#6086)

[vanhci]

Summary

Add the deployment boolean field to job-environment-mapping in the workflow schema to support the new GitHub Actions syntax that allows workflows to run in an environment without creating a deployment object.

Changes

• Added deployment field (type: boolean) to job-environment-mapping.properties in pkg/schema/workflow_schema.json

Test Case

The following workflow now validates correctly:

jobs:
  example:
    runs-on: ubuntu-latest
    environment:
      name: production
      deployment: false  # New field
    steps:
      - run: echo "Hello"

Issue

Fixes #6086