feat(v8): Remove defaultIntegrations deprecated export

[AbhiPrasad]

ref https://github.com/getsentry/sentry-javascript/issues/10100

Removes deprecated defaultIntegrations export everywhere.

[github-actions[bot]]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	77.93 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	69.18 KB (0%)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	73.11 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	62.77 KB (-0.02% 🔽)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	33.37 KB (-0.04% 🔽)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	33.26 KB (-0.07% 🔽)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	31.22 KB (+0.05% 🔺)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	31.22 KB (+0.03% 🔺)
@sentry/browser - Webpack (gzipped)	22.47 KB (-0.02% 🔽)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	76.25 KB (-0.02% 🔽)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	67.79 KB (-0.02% 🔽)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	33.73 KB (-0.04% 🔽)
@sentry/browser - ES6 CDN Bundle (gzipped)	24.79 KB (-0.05% 🔽)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	213.29 KB (-0.02% 🔽)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	101.91 KB (-0.05% 🔽)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	74.29 KB (-0.06% 🔽)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	36.91 KB (-0.04% 🔽)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	69.5 KB (-0.05% 🔽)
@sentry/react - Webpack (gzipped)	22.5 KB (-0.03% 🔽)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	87.06 KB (+0.02% 🔺)
@sentry/nextjs Client - Webpack (gzipped)	50.2 KB (-0.06% 🔽)
@sentry-internal/feedback - Webpack (gzipped)	17.2 KB (0%)