add NetworkAccess to clts (polus plugins)

[agerardin]

Description

Polus plugins should by default add a NetworkAccess attribute set to true to avoid problem with accessing the networks.
Moving forward, we may need to add that to the ICT standard.

Proposal

in cwl v1.2 we need to explicitly grant NetworkAccess

Additional context

https://www.commonwl.org/user_guide/topics/command-line-tool.html