E2E Test - Tracing through Sequences

[Harwayne]

Problem
Once #1762 is finished, tracing through a Sequence will work. To ensure it continues to work, we need an E2E test that verifies it.

Persona:
Contributor

Exit Criteria
A test in the e2e suite that runs before every PR merge. The test verifies that an event sent to a Sequence has at least the following spans appear in the same trace:

• Event sent to the Sequence.
• Every hop through the Sequence.
• Event sent via the Sequence's reply.

[Harwayne]

/project Observability To do

[n3wscott]

similar to https://github.com/knative/eventing/blob/master/test/conformance/broker_tracing_test.go and https://github.com/knative/eventing/blob/master/test/conformance/channel_tracing_test.go.

/good-first-issue

[knative-prow-robot]

@n3wscott:
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In response to this:

similar to https://github.com/knative/eventing/blob/master/test/conformance/broker_tracing_test.go and https://github.com/knative/eventing/blob/master/test/conformance/channel_tracing_test.go.

/good-first-issue

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