Small changes and cleanup to GenAi Utils package to enable google's GenAi instrumentation to use it

[DylanRussell]

Description

Small changes and cleanup to GenAi Utils package to enable google's GenAi instrumentation to use it

Type of change

Please delete options that are not relevant.

• [x ] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Unit tests

Does This PR Require a Core Repo Change?

• Yes. - Link to PR:
• [x ] No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• [x ] Followed the style guidelines of this project
• [ x] Changelogs have been updated
• [ x] Unit tests have been added
• [ x] Documentation has been updated

[DylanRussell]

Is there any reason not to bump up the versions of all the packages in the instrumentations (and therefore also bump up all the requirements.oldest files ?) I don't see a reason not to do that.

[Copilot]

Pull request overview

This PR updates opentelemetry-util-genai to better support upcoming Google GenAI instrumentation usage by aligning dependencies, refining invocation APIs/attributes, and adjusting tests/docs accordingly.

Changes:

• Update test log exporter usage to the newer in-memory log record exporter API.
• Extend inference invocation wiring (operation name support) and add/adjust recorded GenAI attributes.
• Bump OpenTelemetry dependency versions and update package docs/changelog.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
util/opentelemetry-util-genai/tests/test_utils.py	Update in-memory log exporter class used by tests.
util/opentelemetry-util-genai/tests/test_utils_events.py	Update in-memory log exporter class used by event tests.
util/opentelemetry-util-genai/src/opentelemetry/util/genai/handler.py	Add operation_name parameter forwarding for inference factory.
util/opentelemetry-util-genai/src/opentelemetry/util/genai/_tool_invocation.py	Add tool-call arguments attribute on tool spans.
util/opentelemetry-util-genai/src/opentelemetry/util/genai/_invocation.py	Adjust content-capture behavior for tool definitions.
util/opentelemetry-util-genai/src/opentelemetry/util/genai/_inference_invocation.py	Update usage attribute constants and add reasoning token attribute.
util/opentelemetry-util-genai/README.rst	Minor wording update to reference InferenceInvocation.
util/opentelemetry-util-genai/pyproject.toml	Bump OpenTelemetry dependency versions.
util/opentelemetry-util-genai/CHANGELOG.md	Add changelog entry for these prep/cleanup changes.