test(grpc): use latest and oldest dependency sets

[ahmadalguydi]

Description

Simplify the gRPC instrumentation test matrix to the repository's standard latest/oldest dependency pattern.

• Replace the six duplicated grpcio/wrapt requirement files with one test-requirements.in and uv-generated latest / oldest lock files.
• Exercise Python 3.10?3.14 against both dependency sets.
• Keep the supported wrapt range in the input so the oldest resolution covers the lower bound rather than maintaining separate wrapt environments.

Fixes #4201

Validation

• uv pip compile completed for both latest and lowest-direct requirements.
• git diff --check passes.
• Ruff/format checks are not applicable to the requirement files or tox-only changes.
• The local Windows run is environment-limited: 127 tests passed, while Unix-domain-socket tests cannot bind on this host and the installed grpc/protobuf combination causes additional pre-existing compatibility failures. CI's Linux matrix will exercise the generated environments.

[emdneto]

Closing as spam.