Deprecate Go extraction reconciliation feature flag and CODEQL_EXTRACTOR_GO_BUILD_TRACING for custom builds (#1322)

Co-authored-by: Henry Mercer <henry.mercer@me.com>

tests/multi-language-repo/build.sh

@@ -6,6 +6,8 @@ dotnet build -p:UseSharedCompilation=false
 
 javac Main.java
 
+go build main.go
+
 if [[ "$OSTYPE" == "darwin"* || "$OSTYPE" == "linux-gnu"* ]]; then
     swift build
 fi