Fix everest output folder rolling

If ert config is initialized before execution rolling logic we end up with two everest output folders the current one and an empty rolled one.

src/everest/bin/everest_script.py

@@ -52,15 +52,6 @@ def everest_entry(args=None):
             partial(handle_keyboard_interrupt, options=options),
         )
 
-    # Validate ert config
-    try:
-        _ = everest_to_ert_config(options.config)
-    except ValueError as exc:
-        raise SystemExit(f"Config validation error: {exc}") from exc
-
-    if EverestRunModel.create(options.config).check_if_runpath_exists():
-        warn_user_that_runpath_is_nonempty()
-
     asyncio.run(run_everest(options))
 
 
@@ -116,6 +107,16 @@ async def run_everest(options):
             logger.info("Everest forward model contains job {}".format(job_name))
 
         makedirs_if_needed(options.config.output_dir, roll_if_exists=True)
+
+        # Validate ert config
+        try:
+            _ = everest_to_ert_config(options.config)
+        except ValueError as exc:
+            raise SystemExit(f"Config validation error: {exc}") from exc
+
+        if EverestRunModel.create(options.config).check_if_runpath_exists():
+            warn_user_that_runpath_is_nonempty()
+
         try:
             output_dir = options.config.output_dir
             config_file = options.config.config_file