[tests] remove test with pretty errors that brings nothing but pain

tests/misc/projects/Issue10844/user-defined-meta-json-pretty-fail.hxml

@@ -1,4 +0,0 @@
-user-defined-meta-json-fail.hxml
--D message.reporting=pretty
--D message.no-color
-

tests/misc/projects/Issue10844/user-defined-meta-json-pretty-fail.hxml.stderr

@@ -1,12 +0,0 @@
-[ERROR] --macro haxe.macro.Compiler.registerMetadataDescriptionFile('meta.jsno', 'myapp')
-
-   | Uncaught exception Could not read file meta.jsno
-
-    ->  $$normPath(::std::)/haxe/macro/Compiler.hx:390: characters 11-39
-
-    390 |   var f = sys.io.File.getContent(path);
-        |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-        | Called from here
-
-        | Called from here
-