Test new Nimbus syncing algorithm

[jakubgs]

Big changes to Nimbus syncing algorithm are coming in:

• BN: New syncing algorithm nimbus-eth2#7578

We need to test those on testnet fleets, and the simplest way to do that is to change the branch mapping of libp2p nodes temporarily:

infra-nimbus/ansible/group_vars/nimbus.hoodi.yml

Lines 92 to 94 in 3bec6f2

	# We map short names to branches to avoid too long service names.
	node_name_to_branch_map:
	libp2p: 'nim-libp2p-auto-bump-unstable'

Another part of the testing would be to resync nodes from time to time, which we can already do via resync timer setting:

infra-nimbus/ansible/group_vars/nimbus.hoodi.yml

Lines 141 to 143 in 3bec6f2

	# Checkpoint Sync
	beacon_node_resync_enabled: true
	beacon_node_resync_timer_enabled: false

Except in this case we do not want to use the trustedNodeSync command and we want to let it sync from scratch.

[jakubgs]

For now the branch is not ready yet so we need to wait for for @cheatfate to inform us when it's time to go.

[jakubgs]

I've applied the change to the Hoodi nodes:

• infra-nimbus#3349813b - nimbus.hoodi: switch libp2p nodes to use syncv3 branch

I've enabled weekly re-syncs of the nodes using syncv3 branch:

infra-nimbus/ansible/group_vars/nimbus.hoodi.yml

Lines 143 to 144 in 3349813

	beacon_node_resync_timer_enabled: '{{ node.branch == "libp2p" }}' # TEMP: syncv3 testing
	beacon_node_resync_timer_frequency: 'weekly'

If you want more frequent ones please tell me @cheatfate .

[jakubgs]

Verified that all nodes run status-im/nimbus-eth2@3b0ccea:

geth-01.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
geth-02.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
geth-03.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
geth-04.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
geth-05.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
nec-01.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
nec-02.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
nec-03.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
nec-04.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
nec-05.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
neth-01.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
neth-02.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
neth-03.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
neth-04.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"
neth-05.ih-eu-mda1.nimbus.hoodi | CHANGED | rc=0 | (stdout) "Nimbus/v25.9.2-3b0cce-stateofus"