Reland "Make RtpHeaderExtensionId(int) explicit"

This reverts commit 031d798a20cc5d9c867598a38632accb20c6effe.

Reason for revert: Revised constructor deprecation approach

Original change's description:
> Revert "Make RtpHeaderExtensionId(int) explicit"
>
> This reverts commit 9cb2a61b06bacaeb9a7abedc1d00517d7f79548d.
>
> Reason for revert: Suspected downstream failures.
>
> Failure Link: https://fusion2.corp.google.com/invocations/abc66f5c-f5bc-4767-8ff8-e67efeaa0f7c/targets/%2F%2Fbuzz%2Ftest%2Fpclf%2Ftests:absolute_capture_time_test_experiments_launched;config=a544fae14671853db631fbeeb923d84e665cd2045db88e266d17af360c6b5925/tests?q=status:failed%20OR%20status:broken%20OR%20status:cancelled%20OR%20status:running%20OR%20status:timed_out%20OR%20status:tool_failure%20label:buildbucket-8678846321400548705
>
> Original change's description:
> > Make RtpHeaderExtensionId(int) explicit
> >
> > Make RtpHeaderExtensionId(int) constructor explicit to prevent
> > implicit conversions. Added a deprecated template constructor to
> > allow implicit conversion downstream to avoid breaking them. Also
> > added explicit constructor for uint8_t to avoid matching the template
> > in WebRTC.
> >
> > Bug: webrtc:514817938
> > Change-Id: I5f8a03dc2ffb6d6d76164e734e1627f07727da49
> > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/482540
> > Commit-Queue: Harald Alvestrand <hta@webrtc.org>
> > Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
> > Cr-Commit-Position: refs/heads/main@{#48017}
>
> Bug: webrtc:514817938
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Change-Id: I367b804a5f3af448f1ce49b8f178a079edab1612
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/482800
> Auto-Submit: Harald Alvestrand <hta@webrtc.org>
> Commit-Queue: Jeremy Leconte <jleconte@google.com>
> Reviewed-by: Jeremy Leconte <jleconte@google.com>
> Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
> Commit-Queue: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/main@{#48018}

Bug: webrtc:514817938
Change-Id: I476b96e2bdf869a27abe5dd46f4f67693d82d5cd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/482820
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#48037}