Remove active_reset_srtp_params configuration flag

Remove the `active_reset_srtp_params` flag and its associated logic.
This configuration was introduced as a workaround for a specific
Chromium issue (crbug.com/835958) but is no longer required and is
unused in production code.

The cleanup includes:
* Removing the field from `RTCConfiguration` in C++, Java, and
  Objective-C APIs.
* Eliminating internal plumbing in `PeerConnection`, `JsepTransport`,
  `JsepTransportController` and `DtlsSrtpTransport`.
* Deleting the `ActivelyResetSrtpParams` unit test.

No-Iwyu: iwyu reporting is incorrect for peer_connection_interface.h
Bug: webrtc:42235111
Change-Id: I61ec5fe7adfe0e76f7b83edcbbbf771d5c7c093d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/428680
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#46327}