Update message again

Be aware: the welcome message will be updated *several* times throughout this beta, each time containing new information, but could also be to otherwise test the functionality of the message system. When ForgeGradle 7 is stabilized, The welcome message will only be displayed once per minor version bump (7.X).

Author: Jonathing

src/main/java/net/minecraftforge/gradle/Constants.java

@@ -26,7 +26,9 @@ final class Constants {
     /// Use these with [java.text.MessageFormat#format(String, Object...)].
     static final class Messages {
         static final String WELCOME = """
-            Welcome to ForgeGradle 7.0!
+            Welcome to ForgeGradle 7.0 BETA!
+            
+            This is an unstable release of ForgeGradle 7 for testing purposes.
             
             Here are some release highlights:
             - Complete rewrite of the plugin and underlying code.
@@ -51,7 +53,8 @@ If you are on an older version (1.20.4 and older), you will need the
               'net.minecraftforge.obfuscation' plugin. Many of these come with our provided
               MDK, so this should not be an issue for you.
             
-            This message will not display again until ForgeGradle 7.1 or the below file is deleted:
+            This message will not display again until the next major beta update, ForgeGradle
+            7.1, or the below file is deleted:
             {}
             
             For more details on this release, see https://docs.minecraftforge.net/en/fg-7.0/""";

src/main/java/net/minecraftforge/gradle/ForgeGradleFlowAction.java

@@ -54,7 +54,7 @@ protected void run(Parameters parameters) throws IOException {
             if (parameters.getFailure().isPresent()) return;
 
             // check for marker file
-            var markerFile = parameters.messagesDir.file("7_0_BETA_WELCOME").get().getAsFile();
+            var markerFile = parameters.messagesDir.file("7_0_BETA_WELCOME_1").get().getAsFile();
             if (markerFile.exists()) return;
             Files.createDirectories(markerFile.toPath().getParent());
             Files.createFile(markerFile.toPath());