rename child workflow function

[famarting]

Description

implements #643

I deprecated the old function, but since workflows are not stable yet we could completely delete the old function... whatever you prefer

Issue reference

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Please reference the issue this PR will close: #[issue number]

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[famarting]

ping

[marcduiker]

@holopin-bot @famarting Thanks Fabian!

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