add child gauges v2 to labels

[mendesfabio]

From Troy:

WIP:

https://dune.com/queries/3094729

1. I got all root gauges that had received a vote and then joined a table of all the decoded root gauge contracts we have on Dune;
2. Created mapping queries for each type of L2 gauge and joined them on the aforementioned table.

* IIRC these queries are just for the v2 gauges, as I do not recall getting the streamers.

Notes:

• On Optimsim the child chain gauge contract is under balancer_v2 namespace and not balancer. The factory is under balancer namespace. I have updated the queries to use balancer_v2 but ideally it is under balancer. I tried to change it to balancer but it got rejected.
• There some empty polygonZKEVM entries because we have no contract data, obviously. Not a blocker but just noting here.
• There are 9 mainnet gauges from very early on that I was going to wait until the end to resolve.
• I think the main remaining portion is adding the logic for v1 gauges (streamer etc). I believe this is what the remaining missing pool address mappings can be attributed too.
• The namespace and contract naming was a big time sink. There are some instances of 2 different root gauges being mapped to the same recipient search for 0x8fb44263b91cac11a646cee0d44c6600cb4d5ed9 in this query .
• Ideally, all of the gauge related contracts are moved to balancer namespace, removed from balancer v2 (can't be removed if used in a spell so have to change the spell to the new contract namespace first per Antonio), and have uniform naming conventions across the various contracts.

[viniabussafi]

Query ran for Arbitrum. To do: create spell for avalanche, base and gnosis and run PR.

[viniabussafi]

PR created and tested. Waiting for review.

[viniabussafi]

Just for context, the logic is: output_0 balancer_ethereum.CappedArbitrumRootGaugeFactory_call_create recipient --> output_0 balancer_arbitrum.ChildChainGaugeFactory_call_create pool --> address labels.balancer_v2_pools_arbitrum

[viniabussafi]

PR approved. Will close the issue once it's merged and tested

[viniabussafi]

Child gauges added. The only missing labels are for pools with no labels, which we will have to investigate.