ENH - Use miniforge throughout

[trallard]

Fixes #632 Fixes #630

Description

• This should fix the flaky CI errors - it ensures we do not mix defaults and conda-forge, so we use miniforge to set all the environments.
• Added some quick fixes to the env files to silence the pip-related warnings and ensure defaults are not used (I changed the microsoft channel capitalisation, and that might fix #630, though I could not reproduce locally 🤷🏽‍♀️ so I am not sure that is the root cause)

Pull request checklist

• [x] Did you test this change locally?
• [ ] Did you update the documentation (if required)?
• [ ] Did you add/update relevant tests for this change (if required)?

Additional information

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