Enhance script handling and UI consistency

- Added support for encoding the RunContext property in the Script class to determine file suffixes (.server.luau, .client.luau, .plugin.luau, .legacy.luau).
- Updated the Confirming.lua file to improve UI consistency in the confirmation message display.
- Modified snapshot middleware and syncback logic to accommodate new file extensions and ensure proper handling of plugin scripts.
- Refactored tests to align with the new naming conventions for script suffixes and improved path uniqueness checks.

src/syncback/file_names.rs

@@ -39,6 +39,7 @@ pub fn name_for_inst<'old>(
             | Middleware::ServerScriptDir
             | Middleware::ClientScriptDir
             | Middleware::ModuleScriptDir
+            | Middleware::PluginScriptDir
             | Middleware::LocalScriptDir
             | Middleware::LegacyScriptDir => {
                 let name = if encode_invalid_chars {
@@ -110,6 +111,7 @@ pub fn extension_for_middleware(middleware: Middleware) -> &'static str {
         | Middleware::ServerScriptDir
         | Middleware::ClientScriptDir
         | Middleware::ModuleScriptDir
+        | Middleware::PluginScriptDir
         | Middleware::LocalScriptDir
         | Middleware::LegacyScriptDir => {
             unimplemented!("directory middleware requires special treatment")