fix otelhttp setup in activator

[dprotaso]

Attributes weren't showing up on the traces - this fixes the issue.

Also I noticed otelhttp metrics weren't being emitted so we've wired in the right MeterProvider.

[dprotaso]

cc @evankanderson

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.20%. Comparing base (bb17bbb) to head (783d594).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16044      +/-   ##
==========================================
- Coverage   80.22%   80.20%   -0.02%     
==========================================
  Files         214      214              
  Lines       16910    16907       -3     
==========================================
- Hits        13566    13561       -5     
- Misses       2984     2986       +2     
  Partials      360      360              

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[Cali0707]

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, dprotaso

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[dprotaso]

/cherry-pick release-1.19

[knative-prow-robot]

@dprotaso: once the present PR merges, I will cherry-pick it on top of release-1.19 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[knative-prow-robot]

@dprotaso: new pull request created: #16046

In response to this:

/cherry-pick release-1.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.