Bug 1714577 - Part 5 - Add GeckoTraceEvent.h to clang-format-ignore. r=gerald

We're going to modify it, but it will cause unnecessary churn to reformat it to
Gecko style (it would change all indentation, etc.), in case we want to update
it with upstream.

Differential Revision: https://phabricator.services.mozilla.com/D116842

.clang-format-ignore

@@ -198,6 +198,7 @@ toolkit/crashreporter/breakpad-client/.*
 toolkit/crashreporter/google-breakpad/.*
 tools/fuzzing/libfuzzer/.*
 tools/profiler/core/vtune/.*
+tools/profiler/public/GeckoTraceEvent.h # modified vendored copy
 xpcom/build/mach_override.c
 xpcom/build/mach_override.h
 xpcom/io/crc32c.c