Fix pydantic import issue for version <2.10.2

[davorrunje]

Why are these changes needed?

When using Pydantic version < v2.10.2, we get this error:

    from pydantic._internal._typing_extra import try_eval_type  # type: ignore[attr-defined]
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ImportError: cannot import name 'try_eval_type' from 'pydantic._internal._typing_extra' (.../site-packages/pydantic/_internal/_typing_extra.py). Did you mean: '_eval_type'?

The reason is internal change in a way forward references are being evaluated.

This PR uses different functions for evaluating forwarded references, depending on the version of Pydantic installed.

Related issue number

Closes #1316

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.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
autogen/tools/function_utils.py	60.00%	1 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (40014e8) and HEAD (75fca93). Click for more details.

HEAD has 1269 uploads less than BASE

Flag	BASE (40014e8)	HEAD (75fca93)
3.10	96	0
agent-eval	1	0
ubuntu-latest	146	1
cerebras	15	0
3.9	83	0
windows-latest	114	0
gpt-assistant-agent	3	0
3.13	85	0
lmm	4	0
ollama	15	0
swarm	14	0
3.11	64	1
teachable	4	0
3.12	36	0
macos-latest	104	0
retrievechat	15	0
retrievechat-qdrant	14	0
falkordb	2	0
retrievechat-couchbase	3	0
retrievechat-mongodb	10	0
retrievechat-pgvector	10	0
anthropic	16	0
bedrock	15	0
core-without-llm	14	1
optional-deps	141	0
commsagent-slack	9	0
integration	12	0
browser-use	7	0
core-llm	9	0
llama-index-agent	3	0
cohere	15	0
neo4j	2	0
openai-realtime	1	0
long-context	3	0
together	14	0
commsagent-telegram	9	0
gemini-realtime	1	0
groq	14	0
websurfer	15	0
commsagent-discord	9	0
deepseek	1	0
crawl4ai	13	0
jupyter-executor	9	0
interop	13	0
gemini	15	0
mistral	14	0
twilio	9	0
openai	1	0
interop-langchain	9	0
interop-pydantic-ai	9	0
interop-crewai	9	0
graph-rag-falkor-db	6	0
websockets	9	0
docs	6	0
captainagent	1	0
autobuild	1	0

Files with missing lines	Coverage Δ
autogen/tools/function_utils.py	91.30% <60.00%> (-1.24%)	⬇️

... and 68 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.