Move upload_trace_processor generated script to bin/

For consistency with other generated scripts and also to work around
an issue with test_env.py failing to run a script from the current
directory.

Bug: 1050517
Change-Id: I83c0608add7450dc7d7996cc722ca7a809e39581
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2141987Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#757796}

testing/buildbot/gn_isolate_map.pyl

@@ -1731,7 +1731,7 @@
   "upload_trace_processor": {
     "label": "//tools/perf/core/perfetto_binary_roller:upload_trace_processor",
     "type": "generated_script",
-    "script": "upload_trace_processor",
+    "script": "bin/upload_trace_processor",
   },
   "url_unittests": {
     "label": "//url:url_unittests",

tools/perf/core/perfetto_binary_roller/BUILD.gn

@@ -22,7 +22,7 @@ generate_wrapper("upload_trace_processor") {
   }
 
   executable = "upload_trace_processor.py"
-  wrapper_script = "$root_build_dir/upload_trace_processor"
+  wrapper_script = "$root_build_dir/bin/upload_trace_processor"
   executable_args = [
     "--path",
     "@WrappedPath(./$binary_name)",