Revert "Fix std::tmpnam deprecation in event_log_visualizer"

This reverts commit 20101b211bdf290d52bbf04822593364deaee443.

Reason for revert: Broken some downstream projects

Original change's description:
> Fix std::tmpnam deprecation in event_log_visualizer
>
> This CL replaces the deprecated std::tmpnam() function with
> webrtc::test::TempFilename() to avoid compiler warnings on macOS.
>
> This change requires:
> 1. Marking rtc_executable("event_log_visualizer") as testonly = true.
> 2. Adding dependencies on //test:test_support and //test:fileutils.
> 3. Removing the -Wno-deprecated-declarations suppression flag.
>
> Bug: webrtc:14248
> Change-Id: I8989a1839fabf70549843fd37d1c35df6c470efd
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/448160
> Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
> Reviewed-by: Björn Terelius <terelius@webrtc.org>
> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#46883}

Bug: webrtc:14248
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I150f32173a7c72e4190f0087aa5c417c18f31365
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/448286
Auto-Submit: Tomas Gunnarsson <tommi@webrtc.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#46886}