devonfw#739: undo changes, updated EnvironmentCommandlet

undo changes of previous commit, except getMessageIdeHome()-method, as it is never used
Changed isIdeHomeRequired() in EnvironmentCommandlet from true to false, as this was causing unwanted exceptions

cli/src/main/java/com/devonfw/tools/ide/commandlet/EnvironmentCommandlet.java

@@ -41,7 +41,7 @@ public String getName() {
   @Override
   public boolean isIdeHomeRequired() {
 
-    return true;
+    return false;
   }
 
   @Override

cli/src/main/java/com/devonfw/tools/ide/context/AbstractIdeContext.java

@@ -256,6 +256,11 @@ private String getMessageIdeHomeFound() {
     return "IDE environment variables have been set for " + this.ideHome + " in workspace " + this.workspaceName;
   }
 
+  private String getMessageIdeHomeNotFound() {
+
+    return "You are not inside an IDE installation: " + this.cwd;
+  }
+
   private static String getMessageIdeRootNotFound() {
     String root = System.getenv("IDE_ROOT");
     if (root == null) {
@@ -264,7 +269,7 @@ private static String getMessageIdeRootNotFound() {
       return "The environment variable IDE_ROOT is pointing to an invalid path " + root + ". Please reinstall IDEasy or manually repair IDE_ROOT variable.";
     }
   }
-  
+
   /**
    * @return {@code true} if this is a test context for JUnits, {@code false} otherwise.
    */
@@ -278,6 +283,7 @@ protected SystemPath computeSystemPath() {
     return new SystemPath(this);
   }
 
+
   private boolean isIdeHome(Path dir) {
 
     if (!Files.isDirectory(dir.resolve("workspaces"))) {
@@ -803,7 +809,9 @@ private ValidationResult applyAndRun(CliArguments arguments, Commandlet cmd) {
     }
     if (result.isValid()) {
       debug("Running commandlet {}", cmd);
-      if (cmd.isIdeRootRequired() && (this.ideRoot == null)) {
+      if (cmd.isIdeHomeRequired() && (this.ideHome == null)) {
+        throw new CliException(getMessageIdeHomeNotFound(), ProcessResult.NO_IDE_HOME);
+      } else if (cmd.isIdeRootRequired() && (this.ideRoot == null)) {
         throw new CliException(getMessageIdeRootNotFound(), ProcessResult.NO_IDE_ROOT);
       }
       if (cmd.isProcessableOutput()) {