The `generate` RPC method:
- was introduced in 2010
- is now only used for testing
- reaches across multiple components (wallet, mining)

I propose we remove the wallet `generate` RPC method and update all tests to use the `generatetoaddress` RPC method. We can do this non-invasively in the test framework by adding a `generate` method to `TestNode` so that the individual tests do not need to be updated. We could also add a `generate` alias to the `generatetoaddress` RPC method.

Doing this removes a wallet->server dependency and simplifies the wallet->server interface (#10973).

I'm opening this issue before implementing in case anyone has objections.
"getmininginfo\n"
            "\nReturns a json object containing mining-related information."
            "\nResult:\n"
            "{\n"
            "  \"blocks\": nnn,             (numeric) The current block\n"
            "  \"currentblockweight\": nnn, (numeric) The last block weight\n"
            "  \"currentblocktx\": nnn,     (numeric) The last block transaction\n"
            "  \"difficulty\": xxx.xxxxx    (numeric) The current difficulty\n"
            "  \"networkhashps\": nnn,      (numeric) The network hashes per second\n"
            "  \"pooledtx\": n              (numeric) The size of the mempool\n"
            "  \"chain\": \"xxxx\",           (string) current network name as defined in BIP70 (main, test, regtest)\n"
            "  \"warnings\": \"...\"          (string) any network and blockchain warnings\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getmininginfo", "")
            + HelpExampleRpc("getmininginfo", "")
        );
    LOCK(cs_main);
    UniValue obj(UniValue::VOBJ);
    obj.pushKV("blocks",           (int)chainActive.Height());
    obj.pushKV("currentblockweight", (uint64_t)nLastBlockWeight);
    obj.pushKV("currentblocktx",   (uint64_t)nLastBlockTx);
    obj.pushKV("difficulty",       (double)GetDifficulty(chainActive.Tip()));
    obj.pushKV("networkhashps",    getnetworkhashps(request));
    obj.pushKV("pooledtx",         (uint64_t)mempool.size());
    obj.pushKV("chain",            Params().NetworkIDString());
    obj.pushKV("warnings",         GetWarnings("statusbar"));
    return obj;
}
static UniValue prioritisetransaction(const JSONRPCRequest& request)