patch(v5.0.0): create a fresh instance of Web3Provider with this.provider every time

[dbrans]

No description provided.

[mcmire]

What problem does this solve, and can we add a test to prevent the problem from occurring again?

[dbrans]

@mcmire, from the PR description of MetaMask/metamask-extension#25342:

The original patch was introduced 7 months ago by @matthewwalsh0 "because the underlying proxy stopped working, meaning it would no longer send calls to the latest chain but be stuck on the original one. The quick fix was to patch it to create a fresh a Web3Provider for each call."
@jiexi and @shanejonas have since identified the root cause of the issue this patch fixes: ethersjs.Web3Provider is not Proxy-friendly because it stores a reference to the sendAsync method of the provider.

[mcmire]

Thanks @dbrans. I see that this is backporting a change that's already in main, so perhaps not as important to add a test here, but can we add a blurb in the PR description for future reference/context at least? Or perhaps just link to that comment.