fix: remove zora sepolia from testnets

[jsy1218]

In the code pipeline, it failed building due to:

Error: Unknown chain id: 999999999
at ID_TO_NETWORK_NAME (/codebuild/output/src3089245944/src/node_modules/@uniswap/smart-order-router/src/util/chains.ts:281:13)
at /codebuild/output/src3089245944/src/bin/stacks/routing-dashboard-stack.ts:113:78
at Array.map ()
at /codebuild/output/src3089245944/src/bin/stacks/routing-dashboard-stack.ts:108:27
at arrayMap (/codebuild/output/src3089245944/src/node_modules/lodash/lodash.js:653:23)
at map (/codebuild/output/src3089245944/src/node_modules/lodash/lodash.js:9622:14)
at Function.flatMap (/codebuild/output/src3089245944/src/node_modules/lodash/lodash.js:9325:26)
at new RoutingDashboardStack (/codebuild/output/src3089245944/src/bin/stacks/routing-dashboard-stack.ts:102:57)
at new RoutingAPIStack (/codebuild/output/src3089245944/src/bin/stacks/routing-api-stack.ts:225:5)
at Object. (/codebuild/output/src3089245944/src/bin/app.ts:297:1)

The reason is because in SOR, ID_TO_NETWORK_NAME doesn't have the ZORA_SEPOLIA listed there. I think the right fix is to remove ZORA_SEPOLIA from the testnets, because SOR has an open PR about supporting ZORA Uniswap/smart-order-router#501