Update fuzz-chip-cert driver and add corpus

Removed ExtractSubjectDNFromX509Cert (will add into separate driver), and added additional methods instead.
Corpus extracted from unit tests.
NOTE: Corpus is *not* yet minimized.

integrations/fuzz/fuzz-chip-cert-corpus/sChipTest_RCAC_Subject_MatterId_Missing_Cert_CHIP

@@ -0,0 +1,3 @@
+0
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src/credentials/tests/FuzzChipCert.cpp

@@ -8,29 +8,50 @@ using namespace chip::Credentials;
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t * data, size_t len)
 {
-
-    NodeId nodeId;
-    FabricId fabricId;
-
     ByteSpan span(data, len);
 
-    (void) ExtractFabricIdFromCert(span, &fabricId);
-    (void) ExtractNodeIdFabricIdFromOpCert(span, &nodeId, &fabricId);
+    {
+        NodeId nodeId;
+        FabricId fabricId;
+        (void) ExtractFabricIdFromCert(span, &fabricId);
+        (void) ExtractNodeIdFabricIdFromOpCert(span, &nodeId, &fabricId);
+    }
 
     {
-        ChipDN dn;
-        (void) ExtractSubjectDNFromX509Cert(span, dn);
+        CATValues cats;
+        (void) ExtractCATsFromOpCert(span, cats);
     }
 
     {
         Credentials::P256PublicKeySpan key;
         (void) ExtractPublicKeyFromChipCert(span, key);
     }
 
+    {
+        chip::System::Clock::Seconds32 rcacNotBefore;
+        (void) ExtractNotBeforeFromChipCert(span, rcacNotBefore);
+    }
+
+    {
+        Credentials::CertificateKeyId skid;
+        (void) ExtractSKIDFromChipCert(span, skid);
+    }
+
+    {
+        ChipDN subjectDN;
+        (void) ExtractSubjectDNFromChipCert(span, subjectDN);
+    }
+
     {
         ChipCertificateData certData;
         (void) DecodeChipCert(span, certData);
     }
 
+    {
+        uint8_t outCertBuf[kMaxDERCertLength];
+        MutableByteSpan outCert(outCertBuf);
+        (void) ConvertChipCertToX509Cert(span, outCert);
+    }
+
     return 0;
 }