Enable TLS for PingSource's OIDC tests

[Leo6Leo]

This is a sub-issue for issue #7496, and depend on #7320

The E2E tests for PingSource under test/auth verify OIDC authentication but don't enable TLS.

The OIDC features is mostly useful when TLS is enabled for communication between components.

TLS can be enabled for reconciler-test through WithTLS option:

ctx, env := global.Environment(
  ..
  eventshub.WithTLS(t)
  ...
)

The tests will need to be modified to properly start EventsHub receiver/sender with enforced TLS and individual resources which deliver events will have to specify CACerts for Destination:

d := service.AsDestinationRef(sink)
d.CACerts = eventshub.GetCaCerts(ctx)

Exit Criteria
EventsHub receiver/sender with enforced TLS and individual resources which deliver events with CACerts specified for Destination

Time Estimate (optional):
How many developer-days do you think this may take to resolve? 1

Additional context (optional)
Add any other context about the feature request here.

[sadath-12]

/assign