Fix IDX21323: RequireNonce is 'False' during token refreshClient #240
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See https://security.stackexchange.com/questions/147529/openid-connect-nonce-replay-attack and IdentityServer/IdentityServer4#2180 for the purpose of the nonce and why it's unnecessary for the token refresh.
This also switches to using
OpenIdConnectOptions.Backchannel
rather than its ownHttpClient
so it gets an OIDC-specific user agent and includes any other customizations that might be necessary for communicating with the given OIDC provider.Fixes dotnet/aspnetcore#53585