FaithfulnesEvaluator and ContextRelevanceEvaluator cannot be loaded via Pipeline.from_dict

[tstadel]

Describe the bug
As FaithfulnesEvaluator and ContextRelevanceEvaluator do not have the component decorator, Pipeline.from_dict cannot resolve them. The super-init workaround decribed in #7824 should do.

Error message
haystack.core.errors.PipelineError: Component 'haystack.components.evaluators.faithfulness.FaithfulnessEvaluator' not imported.

Expected behavior
They can be loaded from_dict

Additional context
Add any other context about the problem here, like document types / preprocessing steps / settings of reader etc.

To Reproduce

import yaml
from haystack import Pipeline
pipeline_yaml = """
    components:
        generator:
            init_parameters: {}
            type: haystack.components.evaluators.faithfulness.FaithfulnessEvaluator
       """
pipeline_config = yaml.load(pipeline_yaml, Loader=yaml.FullLoader)
pipeline = Pipeline.from_dict(pipeline_config)

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System:

• OS:
• GPU/CPU:
• Haystack version (commit or version number):
• DocumentStore:
• Reader:
• Retriever: