feat(v8): Remove @sentry/tracing

[AbhiPrasad]

resolves https://github.com/getsentry/sentry-javascript/issues/8796

Aside from deleting the tracing package and all of it's references, it also moves some relevant tests into core.

[github-actions[bot]]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	77.51 KB (-0.26% 🔽)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	68.78 KB (-0.28% 🔽)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	72.7 KB (-0.26% 🔽)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	62.3 KB (-0.31% 🔽)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	33 KB (-0.57% 🔽)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	32.89 KB (-0.58% 🔽)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	30.91 KB (-0.65% 🔽)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	30.91 KB (-0.64% 🔽)
@sentry/browser - Webpack (gzipped)	22.19 KB (-0.91% 🔽)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	76 KB (+0.07% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	67.53 KB (+0.1% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	33.45 KB (+0.09% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped)	24.72 KB (+0.18% 🔺)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	212.14 KB (+0.05% 🔺)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	100.86 KB (+0.09% 🔺)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	73.93 KB (+0.15% 🔺)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	36.74 KB (+0.05% 🔺)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	69.09 KB (-0.29% 🔽)
@sentry/react - Webpack (gzipped)	22.22 KB (-0.91% 🔽)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	86.56 KB (-0.23% 🔽)
@sentry/nextjs Client - Webpack (gzipped)	49.8 KB (-0.38% 🔽)
@sentry-internal/feedback - Webpack (gzipped)	17.14 KB (0%)