Tests failing on `main` branch because `extra_facets_dir` config option is still tested but should be removed in v2.15.0

[bouweandela]

Failing run: https://github.com/ESMValGroup/ESMValCore/actions/runs/28354489927

Result:

ERROR tests/unit/config/test_config_validator.py::test_extra_facets_dir_tuple_deprecated - esmvalcore.exceptions.InvalidConfigParameter: The configuration option or command line argument `extra_facets_dir` has been removed in ESMValCore version 2.15.0. Please use the option `extra_facets` instead (see https://github.com/ESMValGroup/ESMValCore/pull/2747 for details).
ERROR tests/unit/test_dataset.py::test_get_deprecated_extra_facets - esmvalcore.exceptions.InvalidConfigParameter: The configuration option or command line argument `extra_facets_dir` has been removed in ESMValCore version 2.15.0. Please use the option `extra_facets` instead (see https://github.com/ESMValGroup/ESMValCore/pull/2747 for details).
ERROR tests/unit/test_dataset.py::test_get_extra_facets_ignore_deprecated_facets - esmvalcore.exceptions.InvalidConfigParameter: The configuration option or command line argument `extra_facets_dir` has been removed in ESMValCore version 2.15.0. Please use the option `extra_facets` instead (see https://github.com/ESMValGroup/ESMValCore/pull/2747 for details). Since the environment variable ESMVALTOOL_USE_NEW_EXTRA_FACETS_CONFIG is set, `extra_facets_dir` is ignored. To silent this warning, omit `extra_facets_dir`.
FAILED tests/unit/config/test_config_validator.py::test_extra_facets_dir_tuple_deprecated - esmvalcore.exceptions.InvalidConfigParameter: The configuration option or command line argument `extra_facets_dir` has been removed in ESMValCore version 2.15.0. Please use the option `extra_facets` instead (see https://github.com/ESMValGroup/ESMValCore/pull/2747 for details).
FAILED tests/unit/config/test_config_validator.py::test_deprecate_extra_facets_dir - Failed: DID NOT WARN. No warnings of type (<class 'esmvalcore.exceptions.ESMValCoreDeprecationWarning'>,) were emitted.
 Emitted warnings: [].
FAILED tests/integration/cmor/_fixes/icon/test_icon.py::test_add_latitude_longitude - ValueError: Failed to add missing latitude coordinate 'clat' to cube
FAILED tests/unit/test_dataset.py::test_get_deprecated_extra_facets - esmvalcore.exceptions.InvalidConfigParameter: The configuration option or command line argument `extra_facets_dir` has been removed in ESMValCore version 2.15.0. Please use the option `extra_facets` instead (see https://github.com/ESMValGroup/ESMValCore/pull/2747 for details).
FAILED tests/unit/test_dataset.py::test_get_extra_facets_ignore_deprecated_facets - esmvalcore.exceptions.InvalidConfigParameter: The configuration option or command line argument `extra_facets_dir` has been removed in ESMValCore version 2.15.0. Please use the option `extra_facets` instead (see https://github.com/ESMValGroup/ESMValCore/pull/2747 for details). Since the environment variable ESMVALTOOL_USE_NEW_EXTRA_FACETS_CONFIG is set, `extra_facets_dir` is ignored. To silent this warning, omit `extra_facets_dir`.

[valeriupredoi]

triggered by #3048

[bouweandela]

Not really. Triggered by updating the version number on the main branch by merging #3120.

[valeriupredoi]

Not really. Triggered by updating the version number on the main branch by merging #3120.

indeed! I shoot first and ask questions later, sorry, Bouwe