fix(completion): more quoting for file_completion/directory_completion (#15299)

# Description

Found inconsistent behaviors of `directory_completion` and
`file_completion`, https://github.com/nushell/nushell/issues/13951

https://github.com/nushell/reedline/pull/886

Also there're failing cases with such file names/dir names `foo(`,
`foo{`, `foo[`.
I think it doesn't harm to be more conservative at adding quotes, even
if it might be unnecessary for paired names like `foo{}`.

# User-Facing Changes

# Tests + Formatting

Adjusted

# After Submitting

crates/nu-cli/tests/completions/mod.rs

@@ -896,6 +896,7 @@ fn partial_completions() {
         folder(dir.join("partial-a")),
         folder(dir.join("partial-b")),
         folder(dir.join("partial-c")),
+        format!("`{}`", folder(dir.join("partial-d("))),
     ];
 
     // Match the results
@@ -938,6 +939,7 @@ fn partial_completions() {
         file(dir.join("partial-b").join("hello_b")),
         file(dir.join("partial-b").join("hi_b")),
         file(dir.join("partial-c").join("hello_c")),
+        format!("`{}`", file(dir.join("partial-d(").join(".gitkeep"))),
     ];
 
     // Match the results
@@ -985,6 +987,15 @@ fn partial_completions() {
                 .join("final_partial")
                 .join("somefile"),
         ),
+        format!(
+            "`{}`",
+            file(
+                dir.join("partial-d(")
+                    .join("..")
+                    .join("final_partial")
+                    .join("somefile"),
+            )
+        ),
     ];
 
     // Match the results
@@ -1065,6 +1076,16 @@ fn partial_completion_with_dot_expansions() {
                 .join("final_partial")
                 .join("somefile"),
         ),
+        format!(
+            "`{}`",
+            file(
+                dir.join("partial-d(")
+                    .join("...")
+                    .join("partial_completions")
+                    .join("final_partial")
+                    .join("somefile"),
+            )
+        ),
     ];
 
     // Match the results
@@ -1389,6 +1410,9 @@ fn file_completion_quoted() {
         "`-inf`",
         "`4.2`",
         "\'[a] bc.txt\'",
+        "`curly-bracket_{.txt`",
+        "`semicolon_;.txt`",
+        "'square-bracket_[.txt'",
         "`te st.txt`",
         "`te#st.txt`",
         "`te'st.txt`",