Missing validation of variable name

[barmac]

Describe the bug

When you try to deploy a model with input or output mapping named inner-outer, the deployment fails with the following error:

Command 'CREATE' rejected with code 'INVALID_ARGUMENT': Expected to deploy new resources, but encountered the following errors:
'New BPMN diagram.bpmn': - Element: Event_1grs7z6 > extensionElements > ioMapping > output
    - ERROR: Expected path expression 'inner-lost' but doesn't match the pattern '[a-zA-Z_][a-zA-Z0-9_]*(\.[a-zA-Z_][a-zA-Z0-9_]*)*'.
- Element: Activity_1h69l8i > extensionElements > ioMapping > output
    - ERROR: Expected path expression 'inner-outer' but doesn't match the pattern '[a-zA-Z_][a-zA-Z0-9_]*(\.[a-zA-Z_][a-zA-Z0-9_]*)*'.
[ deploy-error ] 30/7/2025 15:23:42

Steps to reproduce

1. Try to deploy attached diagram:

New BPMN diagram.bpmn.txt

Expected behavior

An error should be reported.

Environment

• OS: [e.g. MacOS 10.2, Windows 10]
• Camunda Modeler Version: [e.g. 2.0.0]
• Execution Platform: [e.g. Camunda 7, Camunda 8]
• Installed plug-ins: [...]

Additional context

No response