Utilize `-quiet` flag in java_api_library

java_api_library finds and zips class files based on pattern matching,
leading to multiple missing files warnings being printed to console
during from-text stub build. This change passes the `-quiet` flag to
soong_zip to prevent such warnings from being printed.

Test: m --build-from-text-stub and inspect console output
Bug: 300166930
Change-Id: I23d49b5e3a29d2127f5e917169620e18a98bc06b
diff --git a/java/java.go b/java/java.go
index 99bb1b3..b925312 100644
--- a/java/java.go
+++ b/java/java.go
@@ -1798,6 +1798,7 @@
 		Flag("-jar").
 		Flag("-write_if_changed").
 		Flag("-ignore_missing_files").
+		Flag("-quiet").
 		FlagWithArg("-C ", unzippedSrcJarDir.String()).
 		FlagWithInput("-l ", classFilesList).
 		FlagWithOutput("-o ", al.stubsJarWithoutStaticLibs)