Deprecate openai-v2 and openai-agents-v2 instrumentations (#4904)

* Deprecate openai-v2 and openai-agents-v2 instrumentations

These instrumentations moved to opentelemetry-instrumentation-genai-openai and opentelemetry-instrumentation-genai-openai-agents in the opentelemetry-python-genai repository.

- Mark the instrumentor classes as deprecated via typing_extensions.deprecated with a docstring note pointing to the new packages
- Add deprecation warnings to the package READMEs (new package name, breaking changes, changelog link)
- Point the instrumentation-genai README table rows to the new packages
- Cap opentelemetry-util-genai to < 0.6b0 and add typing-extensions dependency
- Remove both packages from component_owners.yml and the non-patch release workflow

* chlog

* Apply suggestion from @lmolkova

* Note the moved GenAI instrumentations in genai AGENTS.md

* feedback