#557)

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## Description

When trying to reproduce a remote relationships bug, I managed to find
this bug where remote relationships to commands ignore the argument
mappings. A command argument can be called one thing in the NDC itself
(ie, `id`), but we might want to expose it as `actor_id` in the engine
as that's nicer for the user. As we referred to everything with
`String`, we did not convert back to the NDC argument name when sending
information from a remote relationship, this PR fixes that.

We also add a `ConnectorArgumentName` newtype which replaces a bunch of
uses of `String`, and would have guided us towards not creating this bug
in the first place.

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## Changelog

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### Product

_(Select all products this will be available in)_

- [X] community-edition
- [X] cloud
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### Type

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- [ ] highlight
- [ ] enhancement
- [X] bugfix
- [ ] behaviour-change
- [ ] performance-enhancement
- [ ] security-fix
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### Changelog entry

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Fix to correctly use argument mappings when resolving remote
relationships to commands.

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V3_GIT_ORIGIN_REV_ID: 2219e50d6cb28456e60c6794dc163d9b90573f8e