Remove obsolete completion

[kumaranvpl]

Why are these changes needed?

Related issue number

Closes #1224, #1226

Checks

• 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.

[sonichi]

There are some dependencies in the repo:

https://github.com/ag2ai/ag2/blob/main/notebook/oai_completion.ipynb
https://github.com/ag2ai/ag2/blob/main/notebook/oai_chatgpt_gpt4.ipynb

Can we update the notebooks' installation sections? For example,
pip install "autogen[blendsearch]<0.2" -> pip install "pyautogen[blendsearch]<0.2"

Also provide a pointer to a latest branch that contain the working code for them, in case users need to refer to the source code.

[kumaranvpl]

@sonichi I have restricted the version below 0.2 and added a note with a link pointing to the tag in repository. Please review it when you can.

[kumaranvpl]

@sonichi Changes done. Review when you are free please.

Done as requested.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ There is a different number of reports uploaded between BASE (40bcd0f) and HEAD (e19ed69). Click for more details.

HEAD has 1268 uploads less than BASE

Flag	BASE (40bcd0f)	HEAD (e19ed69)
3.13	85	0
core-without-llm	14	1
ubuntu-latest	146	1
3.10	96	0
commsagent-discord	9	0
optional-deps	141	0
3.9	83	0
macos-latest	104	0
3.11	64	1
browser-use	7	0
commsagent-slack	9	0
3.12	36	0
commsagent-telegram	9	0
windows-latest	114	0
crawl4ai	13	0
docs	6	0
graph-rag-falkor-db	6	0
interop	13	0
interop-crewai	9	0
interop-langchain	9	0
interop-pydantic-ai	9	0
retrievechat	15	0
retrievechat-mongodb	10	0
jupyter-executor	9	0
retrievechat-pgvector	10	0
twilio	9	0
retrievechat-qdrant	14	0
websockets	9	0
bedrock	15	0
agent-eval	1	0
gpt-assistant-agent	3	0
anthropic	16	0
cerebras	15	0
retrievechat-couchbase	3	0
cohere	15	0
llama-index-agent	3	0
lmm	4	0
gemini	15	0
groq	14	0
mistral	14	0
ollama	15	0
teachable	4	0
swarm	14	0
long-context	3	0
together	14	0
websurfer	15	0
integration	12	0
core-llm	9	0
falkordb	2	0
openai-realtime	1	0
gemini-realtime	1	0
autobuild	1	0
neo4j	2	0
deepseek	1	0
openai	1	0

Files with missing lines	Coverage Δ
autogen/__init__.py	100.00% <ø> (ø)
autogen/code_utils.py	75.00% <100.00%> (+5.99%)	⬆️
autogen/math_utils.py	7.55% <ø> (-47.45%)	⬇️
autogen/oai/__init__.py	100.00% <ø> (ø)

... and 68 files with indirect coverage changes

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