fix: Make regular expression case-insensitive to resolve storybookjs#…

…24120

Description:
- Resolved the bug reported in issue storybookjs#24120, where the regular expression `/Date$/` wasn't matching properties that end with "date" or "Date" due to case sensitivity.
- Changed the regular expression to `/Date$/i` in the configuration file to make it case-insensitive, allowing it to match both "Date" and "date."

Issue: storybookjs#24120

code/lib/cli/src/generators/configure.ts

@@ -152,7 +152,7 @@ export async function configurePreview(options: ConfigurePreviewOptions) {
         controls: {
           matchers: {
            color: /(background|color)$/i,
-           date: /Date$/,
+           date: /Date$/i,
           },
         },
       },