fix(itk): exclude Go v0.3 from HTTP JSON scenarios

[KXHXK]

Description

Summary

• Remove go_v03 from all four nightly HTTP_JSON interoperability scenarios because A2A Go v0.3 does not expose REST/HTTP+JSON endpoints.
• Remove the corresponding 0->4 and 4->0 edges so each scenario's topology remains valid after the SDK list is shortened.
• Keep Go v0.3 coverage unchanged for the supported JSON-RPC and gRPC scenarios.

Validation

• Baseline scenario assertion failed on all four nightly HTTP_JSON scenarios before the change.

• Post-change JSON and topology assertions passed: four HTTP_JSON scenarios exclude go_v03, supported protocols retain it, and every edge index is valid.

• .\docs\mvnw.cmd -q -pl itk -am -DskipTests package passed for the 42-module ITK dependency chain (run through an ASCII drive mapping to avoid the known Windows protoc issue with non-ASCII workspace paths).

• git diff --check passed.

• Follow the CONTRIBUTING Guide.

• Make the Pull Request title follow the Conventional Commits specification.

• Ensure the tests pass.

• Appropriate READMEs were updated (not necessary for this scenario-only correction).

AI assistance: OpenAI Codex was used for repository analysis, the focused edit, and validation.

Fixes #979