Revert "Support std::string_view in RTC_LOG macros"

This reverts commit 90ef797418efc68bdd4299b3c9b090fe238dbb8f.

Reason for revert: breaks downstream
new LogArgType should be handled in logging.cc

Original change's description:
> Support std::string_view in RTC_LOG macros
>
> Update the logging framework to handle std::string_view as a distinct
> type to prevent memory safety issues.
>
> On certain toolchains, such as the Android NDK, std::string_view and
> absl::string_view are separate types. Relying on implicit conversions
> between them within logging macros can lead to the creation of temporary
> objects. Capturing the address of these temporaries results in dangling
> pointers, which causes undefined behavior or crashes during logging.
>
> This change introduces a dedicated MakeVal overload for std::string_view
> and updates internal type traits to:
> * Explicitly support std::string_view when it differs from
>   absl::string_view.
> * Prevent std::string_view from matching generic stringify or class
>   templates that may handle it incorrectly.
> * Ensure stable references to string data across different platforms
>   and compiler configurations.
>
> Previously, this was implicitly (and not explicitly intentionally) been
> handled by the deprecated stringstream MakeVal implementation.
>
> Bug: webrtc:42234461
> Change-Id: I1d4fd044837e8ac2b117a12e8da351ce5502953e
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/468860
> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#47602}

Bug: webrtc:42234461
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Change-Id: I9604b0ab373dc58355f9b58704e322d1ee52f91d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/469261
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Auto-Submit: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47606}