fix: fix Agent implementation and Mem0MemoryStore test

[anakin87]

Related Issues

• Failing nightly tests: https://github.com/deepset-ai/haystack-experimental/actions/runs/23030253016

Proposed Changes:

• Experimental Agent implementation was not compatible with fix: Make PipelineRuntimeError handling in Agent.run_async the same as Agent.run and fix tool break point validation haystack#10639 -> we now inspect the _runtime_checks method signatur and send the right parameters
• Mem0 seems to have changed some behavior over time: with infer=True (default), multiple messages can be compressed in a single memory -> Adapted the test
• (also clarified that one of the integration tests needs to run with a specific Mem0 instance)

How did you test it?

CI

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[sjrl]

Thanks for the fix!