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/LibSQL/CMakeLists.txt

@@ -41,4 +41,4 @@ set(GENERATED_SOURCES
 )
 
 serenity_lib(LibSQL sql)
-target_link_libraries(LibSQL PRIVATE LibCore LibIPC LibSyntax LibRegex)
+target_link_libraries(LibSQL PRIVATE LibCore LibFileSystem LibIPC LibSyntax LibRegex)

Userland/Libraries/LibSQL/SQLClient.cpp

@@ -10,11 +10,11 @@
 #include <LibSQL/SQLClient.h>
 
 #if !defined(AK_OS_SERENITY)
-#    include <LibCore/DeprecatedFile.h>
 #    include <LibCore/Directory.h>
 #    include <LibCore/SocketAddress.h>
 #    include <LibCore/StandardPaths.h>
 #    include <LibCore/System.h>
+#    include <LibFileSystem/FileSystem.h>
 #endif
 
 namespace SQL {
@@ -24,7 +24,7 @@ namespace SQL {
 // This is heavily based on how SystemServer's Service creates its socket.
 static ErrorOr<int> create_database_socket(DeprecatedString const& socket_path)
 {
-    if (Core::DeprecatedFile::exists(socket_path))
+    if (FileSystem::exists(socket_path))
         TRY(Core::System::unlink(socket_path));
 
 #    ifdef SOCK_NONBLOCK
@@ -102,7 +102,7 @@ static ErrorOr<void> launch_server(DeprecatedString const& socket_path, Deprecat
 
 static ErrorOr<bool> should_launch_server(DeprecatedString const& pid_path)
 {
-    if (!Core::DeprecatedFile::exists(pid_path))
+    if (!FileSystem::exists(pid_path))
         return true;
 
     Optional<pid_t> pid;