fix(nextjs): Delete css map files

[chargome]

closes #18125

We want to delete *.map.css files when deleteSourcemapsAfterUpload is enabled.

[github-actions]

size-limit report 📦

⚠️ Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

Path	Size	% Change	Change
@sentry/browser	24.59 kB	-	-
@sentry/browser - with treeshaking flags	23.08 kB	-	-
@sentry/browser (incl. Tracing)	41.22 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	45.5 kB	-	-
@sentry/browser (incl. Tracing, Replay)	79.7 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	69.37 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	84.39 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	96.57 kB	-	-
@sentry/browser (incl. Feedback)	41.27 kB	-	-
@sentry/browser (incl. sendFeedback)	29.26 kB	-	-
@sentry/browser (incl. FeedbackAsync)	34.19 kB	-	-
@sentry/react	26.29 kB	-	-
@sentry/react (incl. Tracing)	43.21 kB	-	-
@sentry/vue	29.07 kB	-	-
@sentry/vue (incl. Tracing)	42.99 kB	-	-
@sentry/svelte	24.61 kB	-	-
CDN Bundle	26.89 kB	-	-
CDN Bundle (incl. Tracing)	41.77 kB	-	-
CDN Bundle (incl. Tracing, Replay)	78.3 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	83.77 kB	-	-
CDN Bundle - uncompressed	78.84 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	123.97 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	240 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	252.76 kB	-	-
@sentry/nextjs (client)	45.31 kB	-	-
@sentry/sveltekit (client)	41.61 kB	-	-
@sentry/node-core	50.76 kB	-	-
@sentry/node	157.82 kB	-	-
@sentry/node - without tracing	92.64 kB	-	-
@sentry/aws-serverless	106.44 kB	+0.08%	+76 B 🔺

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