configure.{sh,fsx}: improve 1st time .NET run UX

1. Skip dotnet (Core) welcome message, otherwise it might be
confusing to see it pop up when calling our configure script.

2. First time `dotnet fsi` is run, it takes a while to start
(at least 20 or 30seconds on my VirtualBox VM running
Ubuntu22.04.3) so it's better if that time is spent after
printing ellipsis (...) so that it is more clear that one
needs to wait.

configure.sh

@@ -7,7 +7,7 @@ RUNNER_ARG=invalid
 REPL_CHECK_MSG="checking for a working F# REPL..."
 
 if which dotnet >/dev/null 2>&1; then
-    echo "$REPL_CHECK_MSG" $'found'
+    echo -n "$REPL_CHECK_MSG"
     RUNNER_BIN=dotnet
     RUNNER_ARG=fsi
 else
@@ -35,7 +35,7 @@ else
             echo "$0" $'failed, please install "dotnet" first'
             exit 1
         else
-            echo "$FSX_CHECK_MSG" $'found'
+            echo -n "$FSX_CHECK_MSG"
             RUNNER_BIN=fsx
             RUNNER_ARG=
         fi
@@ -53,11 +53,11 @@ else
                 cd scripts/fsx && ./configure.sh --prefix=$BIN_DIR && make install && cd ../..
                 RUNNER_BIN="$BIN_DIR/bin/fsx"
             else
-                echo "$FSX_CHECK_MSG" $'found'
+                echo -n "$FSX_CHECK_MSG"
                 RUNNER_BIN=fsx
             fi
         else
-            echo "$REPL_CHECK_MSG" $'found'
+            echo -n "$REPL_CHECK_MSG"
             RUNNER_BIN=fsharpi
             RUNNER_ARG="--define:LEGACY_FRAMEWORK"
         fi
@@ -73,4 +73,4 @@ if [ ! -z "${RUNNER_ARG}" ]; then
     echo -e "FsxRunnerArg=$RUNNER_ARG" >> scripts/build.config
 fi
 source scripts/build.config
-$RUNNER_BIN $RUNNER_ARG ./scripts/configure.fsx "$@"
+DOTNET_NOLOGO=true $RUNNER_BIN $RUNNER_ARG ./scripts/configure.fsx "$@"

scripts/configure.fsx

@@ -16,6 +16,8 @@ open Fsdk
 open Fsdk.Process
 
 
+Console.WriteLine " found"
+
 let rootDir = DirectoryInfo(Path.Combine(__SOURCE_DIRECTORY__, ".."))
 
 let initialConfigFile, buildTool =