Disable flaky tests reported in 5848/5844 (#5851)

Reported in:
#5844
#5848

.gitlab/pipeline/zombienet/polkadot.yml

@@ -108,7 +108,7 @@ zombienet-polkadot-functional-0004-parachains-disputes-garbage-candidate:
       --local-dir="${LOCAL_DIR}/functional"
       --test="0004-parachains-garbage-candidate.zndsl"
 
-zombienet-polkadot-functional-0005-parachains-disputes-past-session:
+.zombienet-polkadot-functional-0005-parachains-disputes-past-session:
   extends:
     - .zombienet-polkadot-common
   script:
@@ -351,7 +351,7 @@ zombienet-polkadot-malus-0001-dispute-valid:
       --local-dir="${LOCAL_DIR}/integrationtests"
       --test="0001-dispute-valid-block.zndsl"
 
-zombienet-polkadot-coretime-revenue:
+.zombienet-polkadot-coretime-revenue:
   extends:
     - .zombienet-polkadot-common
   needs: