Release 0.7.4b2

[davorrunje]

Why are these changes needed?

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• I've included any doc changes needed for https://docs.ag2.ai/. See https://docs.ag2.ai/docs/contributor-guide/documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Flag	Coverage Δ
3.10	59.67% <100.00%> (+2.80%)	⬆️
3.11	57.11% <100.00%> (?)
3.12	54.41% <100.00%> (?)
3.13	59.13% <100.00%> (+23.42%)	⬆️
3.9	58.82% <100.00%> (+23.48%)	⬆️
anthropic	15.58% <100.00%> (?)
bedrock	15.93% <100.00%> (?)
browser-use	29.66% <100.00%> (-0.01%)	⬇️
cerebras	15.66% <100.00%> (?)
cohere	15.70% <100.00%> (?)
commsagent-discord	30.03% <100.00%> (-0.01%)	⬇️
commsagent-slack	30.02% <100.00%> (-0.01%)	⬇️
commsagent-telegram	29.97% <100.00%> (-0.01%)	⬇️
crawl4ai	29.75% <100.00%> (-0.01%)	⬇️
docs	28.75% <100.00%> (-0.01%)	⬇️
gemini	15.66% <100.00%> (?)
graph-rag-falkor-db	28.22% <100.00%> (-0.01%)	⬇️
groq	15.68% <100.00%> (?)
interop	29.61% <100.00%> (-0.01%)	⬇️
jupyter-executor	30.80% <100.00%> (-0.02%)	⬇️
lmm	18.38% <100.00%> (?)
long-context	14.86% <100.00%> (?)
macos-latest	60.13% <100.00%> (+2.76%)	⬆️
mistral	15.40% <100.00%> (?)
ollama	16.05% <100.00%> (?)
retrievechat	29.72% <100.00%> (+0.03%)	⬆️
retrievechat-mongodb	29.71% <100.00%> (+1.19%)	⬆️
retrievechat-pgvector	29.71% <100.00%> (+1.19%)	⬆️
retrievechat-qdrant	29.66% <100.00%> (+1.21%)	⬆️
teachable	15.02% <100.00%> (?)
together	15.71% <100.00%> (?)
twilio	28.44% <100.00%> (-0.01%)	⬇️
ubuntu-latest	60.15% <100.00%> (+2.80%)	⬆️
websurfer	17.81% <100.00%> (?)
windows-latest	57.90% <100.00%> (+2.82%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
autogen/agentchat/groupchat.py	75.03% <ø> (+4.28%)	⬆️
autogen/messages/agent_messages.py	96.62% <100.00%> (ø)

... and 9 files with indirect coverage changes