Fix TimeSnapshotResponse command types/names to match spec updates (#31018)

* Fix General Diagnostics XML to match spec

See CHIP-Specifications/connectedhomeip-spec#8673

* Regen zap

---------

Co-authored-by: tennessee.carmelveilleux@gmail.com <tennessee@google.com>

Author: tcarmelveilleux

examples/air-purifier-app/air-purifier-common/air-purifier-app.matter

@@ -811,8 +811,8 @@ cluster GeneralDiagnostics = 51 {
   }
 
   response struct TimeSnapshotResponse = 2 {
-    systime_us systemTimeUs = 0;
-    nullable epoch_us UTCTimeUs = 1;
+    systime_ms systemTimeMs = 0;
+    nullable posix_ms posixTimeMs = 1;
   }
 
   /** Provide a means for certification tests to trigger some test-plan-specific events */

examples/air-quality-sensor-app/air-quality-sensor-common/air-quality-sensor-app.matter

@@ -764,8 +764,8 @@ cluster GeneralDiagnostics = 51 {
   }
 
   response struct TimeSnapshotResponse = 2 {
-    systime_us systemTimeUs = 0;
-    nullable epoch_us UTCTimeUs = 1;
+    systime_ms systemTimeMs = 0;
+    nullable posix_ms posixTimeMs = 1;
   }
 
   /** Provide a means for certification tests to trigger some test-plan-specific events */