Some recipes are broken after new ESMValCore release v2.0.6b.

[Peter9192]

Describe the bug
The new release changes the way fixes work. This leads to 2 types of errors in test_recipes.py:

1. Recipes that are now broken due to missing key mip. Here, the mip needs to be added to the recipes. This affects the following recipes:

• recipe_validation.yml
• recipe_validation_CMIP6.yml
• recipe_autoassess_radiation_rms_cfMon_all.yml
• recipe_autoassess_radiation_rms_Amon_obs.yml
• recipe_autoassess_radiation_rms_Amon_all.yml

2. Tests failing because the test calls fix_metadata after get_reference_levels. In this case only the tests are broken, not the recipes themselves. These tests can be fixed by changing the test, e.g. by adding a mock. This affects the following recipes:

• recipe_perfmetrics_CMIP5.yml
• recipe_collins13ipcc.yml
• recipe_smpi_4cds.yml
• recipe_perfmetrics_CMIP5_4cds.yml
• recipe_smpi.yml
• recipe_preprocessor_test.yml
• recipe_correlation.yml