update to copernicusmarine toolbox 2.0 after release

[veenstrajelmer]

https://github.com/mercator-ocean/copernicus-marine-toolbox/tree/copernicusmarine-toolbox-v2

Relevant tests: pytest tests/test_observations.py tests/test_download.py -m "not era5slow"
All tests are green on 11-10-2024 after running them with pre-release (pip install copernicusmarine==2.0.0a2)

However, all tests fail with copernicusmarine 2.0.0a3 since an argument for login() was updated: TypeError: login() got an unexpected keyword argument 'skip_if_user_logged_in'. There is a new more useful argument though: copernicusmarine.login(check_credentials_valid=True).

From Anais of CopernicusMarineService: "The version 2.0.0 should be officially out in November and there will be (at least) 6 months to allow you and other users, to migrate from version 1 to version 2. Support, guidance and even dedicated slots for helping to migrate will be proposed, depending on users' profiles."

Todo:

• update to this new argument
• update minimal copernicusmarine version in toml
• remove cmems registration message #997