Add absl_deps field for rtc_test and rtc_executable

To be able to build these targets in chromium we need to replace all abseil dependencies with "//third_party/abseil-cpp:absl".

Bug: webrtc:12404
Change-Id: Ie0f6af73f2abc73e5744520cfd9a6414e2f948e3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/202762
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Andrey Logvin <landrey@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33108}

modules/video_coding/codecs/av1/BUILD.gn

@@ -88,6 +88,7 @@ if (rtc_include_tests) {
     deps = [
       ":av1_svc_config",
       "../../../../api/video_codecs:video_codecs_api",
+      "../../../../test:test_support",
     ]
 
     if (enable_libaom) {
@@ -104,7 +105,6 @@ if (rtc_include_tests) {
         "../../../../api/units:data_size",
         "../../../../api/units:time_delta",
         "../../../../api/video:video_frame",
-        "../../../../test:test_support",
         "../../svc:scalability_structures",
         "../../svc:scalable_video_controller",
       ]