refactor, validation: Add ChainstateManagerOpts db options

Use ChainstateManagerOpts struct to remove ArgsManager uses from validation.cpp.

This commit does not change behavior.

src/init.cpp

@@ -1046,6 +1046,7 @@ bool AppInitParameterInteraction(const ArgsManager& args, bool use_syscall_sandb
     {
         ChainstateManager::Options chainman_opts_dummy{
             .chainparams = chainparams,
+            .datadir = args.GetDataDirNet(),
         };
         if (const auto error{ApplyArgsManOptions(args, chainman_opts_dummy)}) {
             return InitError(*error);
@@ -1444,6 +1445,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
     bool fReindexChainState = args.GetBoolArg("-reindex-chainstate", false);
     ChainstateManager::Options chainman_opts{
         .chainparams = chainparams,
+        .datadir = args.GetDataDirNet(),
         .adjusted_time_callback = GetAdjustedTime,
     };
     Assert(!ApplyArgsManOptions(args, chainman_opts)); // no error can happen, already checked in AppInitParameterInteraction