ci: Warn on unused disabled directives

[lforst]

Doesn't turn CI red yet, that would require a bit more effort but at least the eslint language server will scream at us now with warnings.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	77.9 KB (-0.25% 🔽)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	69.13 KB (-0.24% 🔽)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	73.05 KB (-0.25% 🔽)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	62.74 KB (-0.32% 🔽)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	33.31 KB (+0.11% 🔺)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	33.16 KB (+0.08% 🔺)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	31.17 KB (+0.04% 🔺)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	31.16 KB (+0.04% 🔺)
@sentry/browser - Webpack (gzipped)	22.44 KB (+0.17% 🔺)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	75.88 KB (-0.25% 🔽)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	67.43 KB (-0.24% 🔽)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	33.38 KB (+0.03% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped)	24.48 KB (+0.08% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	212.61 KB (-0.29% 🔽)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	101.16 KB (+0.13% 🔺)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	73.57 KB (+0.21% 🔺)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	36.62 KB (+0.24% 🔺)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	69.49 KB (-0.27% 🔽)
@sentry/react - Webpack (gzipped)	22.47 KB (+0.07% 🔺)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	87.31 KB (-0.14% 🔽)
@sentry/nextjs Client - Webpack (gzipped)	50.42 KB (+0.13% 🔺)
@sentry-internal/feedback - Webpack (gzipped)	17.11 KB (-0.07% 🔽)