fix(dsl): structure trigger validation errors

[tracerat]

Summary

• convert trigger-schema validation failures into the standard ActionErrorInfo map
• preserve individual field errors as children in the TRIGGER expression context
• keep workflow error handlers and parent workflows from receiving nested tuple/list details

Testing

• uv run pytest --confcutdir=tests/unit tests/unit/test_dsl_workflow_error_unwrap.py -q
• uv run ruff check tracecat/dsl/workflow.py tests/unit/test_dsl_workflow_error_unwrap.py tests/temporal/test_workflows.py
• uv run ruff format --check tracecat/dsl/workflow.py tests/unit/test_dsl_workflow_error_unwrap.py tests/temporal/test_workflows.py
• uv run basedpyright tracecat/dsl/workflow.py tests/unit/test_dsl_workflow_error_unwrap.py tests/temporal/test_workflows.py
• uv run pre-commit run --files tracecat/dsl/workflow.py tests/unit/test_dsl_workflow_error_unwrap.py tests/temporal/test_workflows.py

The existing Temporal trigger-validation regression assertion was tightened for the new envelope and will run in CI; the local host does not provide the required service stack.

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Summary by cubic

Standardizes trigger input validation errors by wrapping them in an action-compatible ActionErrorInfo envelope with TRIGGER context. Prevents tuple/list detail payloads from leaking to workflow error handlers while preserving field-level errors.

• Bug Fixes
  • Convert trigger-schema failures into a single ActionErrorInfo map in ApplicationError.details (root ref <root>, type ValidationError).
  • Keep field errors as children with expr_context TRIGGER (e.g., default_number, ticket_key), using the original pydantic error type and message.
  • Tighten Temporal tests to assert the new error shape and compatibility with ActionErrorInfoAdapter.

^{Written for commit 8e1d63a. Summary will update on new commits.}