fix(favicons):logo in dark and light mode (#77039)

**Before:**
<img width="700" alt="Screenshot 2024-09-06 at 8 53 08 AM"
src="https://github.com/user-attachments/assets/6f0ad8fe-d1fc-48fc-8a57-347023521de0">

**After:**
![Screenshot 2024-09-06 at 12 19
20 PM](https://github.com/user-attachments/assets/ee7a26ed-8561-41de-8e19-a424b806df7a)

In order, Light Mode, Dark Mode and Dev Mode:
![Screenshot 2024-09-06 at 12 17
55 PM](https://github.com/user-attachments/assets/69276dfb-257f-449a-a05c-bc7fb5fe4063)

src/sentry/web/frontend/generic.py

@@ -24,7 +24,7 @@ NEVER_CACHE = "max-age=0, no-cache, no-store, must-revalidate"
 
 
 def dev_favicon(request, extension):
-    document_root, path = resolve("sentry/images/favicon_dev.png")
+    document_root, path = resolve("sentry/images/favicon-dev.png")
     return static.serve(request, path, document_root=document_root)
 
 

webpack.config.ts

@@ -754,7 +754,7 @@ if (IS_UI_DEV_ONLY || SENTRY_EXPERIMENTAL_SPA) {
       ...(IS_UI_DEV_ONLY
         ? {devServer: `https://127.0.0.1:${SENTRY_WEBPACK_PROXY_PORT}`}
         : {}),
-      favicon: path.resolve(sentryDjangoAppPath, 'images', 'favicon_dev.png'),
+      favicon: path.resolve(sentryDjangoAppPath, 'images', 'favicon-dev.png'),
       template: path.resolve(staticPrefix, 'index.ejs'),
       mobile: true,
       excludeChunks: ['pipeline'],