feat: jumpstart telemetry

[evakravi]

Issue #, if available:

Description of changes:
Adds a user agent heading to training jobs, endpoints, and invoke_endpoint api calls made with JumpStart models.

Testing done:
Pending

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[knikure]

Can we make it a constant? Something like JUMPSTART_UA_SUFFIX = md/js_model_id#<id> js_model_ver#<version> This follows the guidelines of UserAgent string as shared in primate chat.