[GR-47781] Check that the path returned by TruffleLanguage#getLanguageHome() exists

PullRequest: truffleruby/3972
(cherry picked from commit 29c8244)

Author: eregon

src/main/java/org/truffleruby/RubyLanguage.java

@@ -756,7 +756,9 @@ private TruffleFile searchRubyHome(Env env) {
         if (truffleReported != null) {
             var truffleReportedFile = env.getInternalTruffleFile(truffleReported);
             try {
-                truffleReportedFile = truffleReportedFile.getCanonicalFile();
+                if (truffleReportedFile.exists()) {
+                    truffleReportedFile = truffleReportedFile.getCanonicalFile();
+                }
             } catch (IOException e) {
                 throw CompilerDirectives.shouldNotReachHere(e);
             }