Enabling variable obs550lt1aer in recipes

[remi-kazeroni]

Description

This PR uncomments the bits of the recipes recipe_perfmetrics_CMIP5.yml and examples/recipe_check_obs.yml related to the variable obs550lt1aer which could not be processed before Iris 3 was made available. I already tested both bits of recipes successfully.

• Closes recipe_perfmetrices crashes due to standard name error #1561
• Link to documentation:

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[valeriupredoi]

fire at will @remi-kazeroni cheers 🍺