feat(profiler): switch back to zstd compression by default (#4080)

Co-authored-by: nick.ripley <[email protected]>

Author: nsrip-dd

profiler/options.go

@@ -188,7 +188,7 @@ func defaultConfig() (*config, error) {
 		deltaProfiles:        internal.BoolEnv("DD_PROFILING_DELTA", true),
 		logStartup:           internal.BoolEnv("DD_TRACE_STARTUP_LOGS", true),
 		endpointCountEnabled: internal.BoolEnv(traceprof.EndpointCountEnvVar, false),
-		compressionConfig:    cmp.Or(env.Get("DD_PROFILING_DEBUG_COMPRESSION_SETTINGS"), "legacy"),
+		compressionConfig:    cmp.Or(env.Get("DD_PROFILING_DEBUG_COMPRESSION_SETTINGS"), "zstd"),
 		traceConfig: executionTraceConfig{
 			Enabled: internal.BoolEnv("DD_PROFILING_EXECUTION_TRACE_ENABLED", executionTraceEnabledDefault),
 			Period:  internal.DurationEnv("DD_PROFILING_EXECUTION_TRACE_PERIOD", 15*time.Minute),