SourceStampVerification Return more specific error code when verification fails

Summary:
Upstream from Meta
If the source stamp tag is not present, SignatureNotFoundException is thrown.
In such cases , it is better to return with
SourceStampVerificationResult.notPresent() instead of
SourceStampVerificationResult.notVerified()
Also modified Android platform core tests (APCT) to reflect this change

Test: Verified using Android platform core tests (APCT)
All other tests pass successfully

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Change-Id: Ifb4b05b6c4a18646cb72fbdc03c529e80f798b21
Signed-off-by: sourabh-nanoti <sourabhn@meta.com>

core/java/android/util/apk/SourceStampVerifier.java

@@ -142,16 +142,21 @@ public abstract class SourceStampVerifier {
 
     private static SourceStampVerificationResult verify(
             RandomAccessFile apk, byte[] sourceStampCertificateDigest, byte[] manifestBytes) {
+        SignatureInfo signatureInfo;
         try {
-            SignatureInfo signatureInfo =
+            signatureInfo =
                     ApkSigningBlockUtils.findSignature(apk, SOURCE_STAMP_BLOCK_ID);
+        } catch (IOException | SignatureNotFoundException | RuntimeException e) {
+            return SourceStampVerificationResult.notPresent();
+        }
+        try {
             Map<Integer, Map<Integer, byte[]>> signatureSchemeApkContentDigests =
                     getSignatureSchemeApkContentDigests(apk, manifestBytes);
             return verify(
                     signatureInfo,
                     getSignatureSchemeDigests(signatureSchemeApkContentDigests),
                     sourceStampCertificateDigest);
-        } catch (IOException | SignatureNotFoundException | RuntimeException e) {
+        } catch (IOException | RuntimeException e) {
             return SourceStampVerificationResult.notVerified();
         }
     }

core/tests/coretests/src/android/util/apk/SourceStampVerifierTest.java

@@ -100,7 +100,7 @@ public class SourceStampVerifierTest {
         SourceStampVerificationResult result =
                 SourceStampVerifier.verify(mPrimaryApk.getAbsolutePath());
 
-        assertTrue(result.isPresent());
+        assertFalse(result.isPresent());
         assertFalse(result.isVerified());
         assertNull(result.getCertificate());
     }