Switch GlobusExchangeTransport to use SSE

[AK2000]

Summary

The GlobusExchangeTransport has fallen behind the HTTPExchangeTransport where we already switched to SSE events. This PR changes the GlobusExchangeTransport to also use SSE, which also allows us to more gracefully deal with timeouts and mailbox closed issues. This is immediately relevant to using the GlobusExchangeClient with persistent agents, where Nginx will raise Timeout errors that will break the server listening loop.

Related Issues

• Blocking Default Timeout for Cloud Exchange Listen and Receive #390 --- a default timeout will make the GlobusExchangeClient nearly unusable in its current state

Changes

• Breaking (backwards incompatible changes to public interfaces)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change or feature addition)
• Refactor (internal code or design clean up)
• Documentation (no changes to the code)
• Test (changes or additions to testing)
• Build (change to CI workflows or build processes)
• Package (changes to package metadata or dependency versions)

Testing

N/A

Pull Request Checklist

Please confirm the PR meets the following requirements.

• Relevant tags are added based on the types of changes.
• Code changes pass pre-commit (e.g., ruff, mypy, etc.).
• Tests have been added to show the fix is effective or that the new feature works.
• New and existing unit tests pass locally with the changes.
• Docs have been updated and reviewed if relevant.

[AK2000]

This is blocked by a bug in the globus sdk where streaming does not work as expected