fix removes (#175)

related to
-
https://github.com/amtoine/nu-git-manager/actions/runs/7684621264/job/20942567622

## description
not sure why this did not fail before but it does now on the latest
`main` of Nushell 🤔

## changelog
- the first commit is here to show the CI failing (well it did not run
at all, lol, but it fails on locally by using a _nightly_ build and the
latest revision of Nupm)
- the rest should fix the CI and the tests

pkgs/nu-git-manager/nu-git-manager/fs/cache.nu

@@ -72,6 +72,8 @@ export def remove-from-cache [cache_file: path, old_path: path]: nothing -> noth
 #  same place as the expected cache file
 # - create the parent directory of the cache file
 export def clean-cache-dir [cache_file: path]: nothing -> nothing {
-    rm --recursive --force $cache_file
+    if ($cache_file | path exists) {
+        rm --recursive --force $cache_file
+    }
     mkdir ($cache_file | path dirname)
 }

pkgs/nu-git-manager/tests/gm.nu

@@ -21,7 +21,9 @@ def run-with-env [code: closure, --prepare-cache] {
 
     with-env $TEST_ENV $code
 
-    rm --recursive --force --verbose $TEST_ENV_BASE
+    if ($TEST_ENV_BASE | path exists) {
+        rm --recursive --force --verbose $TEST_ENV_BASE
+    }
 }
 
 export def error-with-empty-store [] {