Adding CMIP7 version of recipe_seaice_sensitivity.yml

[NParsonsMO]

Description

Changed end date, variables and test dataset

• Closes Create CMIP7 version of recipe_seaice_sensititvity.yml #4438
  Not changed documentation.

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[NParsonsMO]

New plan - do this after adding in the observations.

[NParsonsMO]

Also, change Notz-style to show two different time periods, as the prescribed values only match part of the new historical,
Mock version to remind myself of the aim:

Consider how to show obs on this (see suggestion in table above)