feat: add my delegatee to Delegates page

[Sekhmet]

Summary

This is supported for delegate-registry and governor-subgraph.

Closes: https://github.com/snapshot-labs/workflow/issues/334

How to test

1. Go to http://localhost:8080/#/sn:0x009fedaf0d7a480d21a27683b0965c0f8ded35b3f1cac39827a25a06a8a682a4/delegates
2. Sign in with Starknet wallet.
3. You see your delegation.
4. Go to Ethereum tab.
5. Connect with Ethereum wallet.
6. You see your delegation.
7. Go to: http://localhost:8080/#/s:cow.eth/delegates
8. You see your delegation.
9. You can undelegate from context menu (it delegates to zero address).
10. Once undelegated (modal shows confirmed status) UI refetches latest data (so your delegation should disappear and delegators counts and VP should update for your previous delegatee).

Screenshots

[wa0x6e]

Should we exclude delegations to the empty address 0x0000000000000000000000000000000000000000 ?

[wa0x6e]

What's the 0.11% percentage based on ? From the full list below, 0.11% is more around 70k vCOW than 9

[Sekhmet]

@wa0x6e it's percentage of your VP relative to total VP this delegatee got.

[wa0x6e]

Seems like the graphql delegates fetching is broken and always return an empty delegate list for ethereum

https://sekhmet-my-delegatee-preview-snapshot-devnet.on-fleek.app/#/sn:0x009fedaf0d7a480d21a27683b0965c0f8ded35b3f1cac39827a25a06a8a682a4/delegates

It works on prod: https://snapshot.box/#/sn:0x009fedaf0d7a480d21a27683b0965c0f8ded35b3f1cac39827a25a06a8a682a4/delegates

[bonustrack]

To undelegate with an ERC20 Votes token you need to delegate to 0x0000000000000000000000000000000000000000 instead of self. The option to undelegate should appear even when I delegate to myself.

[Sekhmet]

Updated, also converted delegatee fetching to use vue-query as previous PR was merged. With this change when you undelegate after modal triggers confirmation data will be refetched (delegatee list and your own delegatee).

[bonustrack]

tACK