Everywhere: Use LibFileSystem where trivial

Author: https://github.com/cammo1123
Commit: 1d24f394c6
Pull-request: https://github.com/SerenityOS/serenity/pull/17789
Reviewed-by: https://github.com/AtkinsSJ
Reviewed-by: https://github.com/caoimhebyrne
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/pascalpuffke
Reviewed-by: https://github.com/timschumi ✅

Userland/Libraries/LibCodeComprehension/Cpp/CppComprehensionEngine.cpp

@@ -9,12 +9,12 @@
 #include <AK/HashTable.h>
 #include <AK/OwnPtr.h>
 #include <AK/ScopeGuard.h>
-#include <LibCore/DeprecatedFile.h>
 #include <LibCore/DirIterator.h>
 #include <LibCpp/AST.h>
 #include <LibCpp/Lexer.h>
 #include <LibCpp/Parser.h>
 #include <LibCpp/Preprocessor.h>
+#include <LibFileSystem/FileSystem.h>
 #include <LibRegex/Regex.h>
 #include <Userland/DevTools/HackStudio/LanguageServers/ConnectionFromClient.h>
 
@@ -736,7 +736,7 @@ Optional<Vector<CodeComprehension::AutocompleteResultEntry>> CppComprehensionEng
         if (!path.starts_with(partial_basename))
             continue;
 
-        if (Core::DeprecatedFile::is_directory(LexicalPath::join(full_dir, path).string())) {
+        if (FileSystem::is_directory(LexicalPath::join(full_dir, path).string())) {
             // FIXME: Don't dismiss the autocomplete when filling these suggestions.
             auto completion = DeprecatedString::formatted("{}{}{}/", prefix, include_dir, path);
             options.empend(completion, include_dir.length() + partial_basename.length() + 1, CodeComprehension::Language::Cpp, path, CodeComprehension::AutocompleteResultEntry::HideAutocompleteAfterApplying::No);