fix(extensibility): adding gsid to summary span

[rishikunnath2747]

Disclaimer: Do not include SAP-internal or customer-specific information in this PR (e.g. internal system URLs, customer names, tenant IDs, or confidential configurations). This is a public repository.

Description

Joule Studio requires GSID for monitoring, but it was not present in summary span. Since that is the only span emitted in case of instructions-only, it was added to that span as well

Type of Change

• Bug fix (non-breaking change that fixes an issue)

Testing

Checklist

• I have read the Contributing Guidelines
• I have verified that my changes solve the issue
• I have added/updated automated tests to cover my changes
• All tests pass locally
• I have verified that my code follows the Code Guidelines
• I have updated documentation (if applicable)
• I have added type hints for all public APIs
• My code does not contain sensitive information (credentials, tokens, etc.)
• I have followed Conventional Commits for commit messages