Remove trailing slash in mpsd_release input

Removes the trailing slash in mpsd_release if present, instead of throwing an error and exiting. We do write a warning that this is happening:

❯ mpsd-software install dev-23a/ foss2021a-mpi
[14:01:04] WARNING  Removed trailing slash from release: dev-23a                                 mpsd_software.py:1266
Release dev-23a is prepared in /home/karnada/Sandbox/Projects/mpsd-software-environments/dev-23a
Release dev-23a is prepared in /home/karnada/Sandbox/Projects/mpsd-software-environments/dev-23a
##### Setting up spack
Cloning into 'spack'...

Closes #22 (closed)

src/mpsd_software_manager/mpsd_software.py

@@ -1260,6 +1260,11 @@ def main():
         initialize_environment(Path(os.getcwd()))
         sys.exit(0)
 
+    # sanity check for common mistakes in command line arguments
+    if args.release.endswith("/"):  # happens easily with autocompletion
+        args.release = args.release.removesuffix("/")
+        logging.warning(f"Removed trailing slash from release: {args.release}")
+
     # root_dir is the place where this MPSD software instance has its root
     root_dir = get_root_dir()
 
@@ -1274,14 +1279,6 @@ def main():
         log_file,
     )
 
-    # sanity check for common mistakes in command line arguments
-    if args.release.endswith("/"):  # happens easily with autocompletion
-        logging.error(
-            f"You provided mpsd-release='{args.release}'. "
-            f"Did you mean '{args.release.removesuffix('/')}'?"
-        )
-        sys.exit(1)
-
     # Check the command and run related function
     if args.action == "remove":
         remove_environment(args.release, root_dir, args.package_set)