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/mod.rs

@@ -383,7 +383,7 @@ pub fn get_best_middleware(snapshot: &SyncbackSnapshot) -> Middleware {
             Middleware::ServerScript => Middleware::ServerScriptDir,
             Middleware::ClientScript => Middleware::ClientScriptDir,
             Middleware::ModuleScript => Middleware::ModuleScriptDir,
-            Middleware::PluginScript => Middleware::ServerScriptDir, // Plugin scripts with children use server script dir for now
+            Middleware::PluginScript => Middleware::PluginScriptDir,
             Middleware::LegacyScript => Middleware::LegacyScriptDir,
             Middleware::LocalScript => Middleware::LocalScriptDir,
             Middleware::Csv => Middleware::CsvDir,