Add otel instrumentation

[blakeroberts-wk]

Motivation

During failure scenarios of establishing a websocket connection in deployed environments, it is difficult to understand the cause and effect of the failure. Likewise, it's difficult to understand the current health/distribution of transport types that SockJS uses.

Changes

OpenTelemetry instrumentation was added to capture the open and close events of SockJS as OpenTelemetry span events.

Additionally, a unit test for the recently added timeout option was added.

Release Notes

Review

See CONTRIBUTING.md for more details on review types (+1 / QA +1 / +10) and code review process.

Please review:

QA Checklist

• Tests were updated and provide good coverage of the changeset and other affected code
• Manual testing was performed if needed
  • Steps from PR author:
  • Anything falling under manual testing criteria outlined in CONTRIBUTING.md

Merge Checklist

While we perform many automated checks before auto-merging, some manual checks are needed:

• A Frontend Architecture member has reviewed these changes
• There are no unaddressed comments - this check can be automated if reviewers use the "Request Changes" feature
• For release PRs - Version metadata in Rosie comment is correct

[blakeroberts-wk]

QA +1 open span event appeared on the expected parent span when these changes were pulled into a test app: