Remove leftover _eventAdapter from EdrProviderWrapper

Seems to be a leftover from #4747 and it looks to be unused now as we create a new instance of `EdrProviderEventAdapter` explicitly in `create()` and move it into lambda.

Feel free to disregard if that's not true and/or we want to keep it.

Author: Xanewok

packages/hardhat-core/src/internal/hardhat-network/provider/provider.ts

@@ -182,7 +182,6 @@ export class EdrProviderWrapper
     private readonly _node: {
       _vm: MinimalEthereumJsVm;
     },
-    private readonly _eventAdapter: EdrProviderEventAdapter,
     private readonly _vmTraceDecoder: VmTraceDecoder,
     private readonly _rawTraceCallbacks: RawTraceCallbacks,
     // The common configuration for EthereumJS VM is not used by EDR, but tests expect it as part of the provider.