feat(v8/core): Remove getters for span.op

[AbhiPrasad]

ref #10677

Continuing the elimination of span properties!

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	77.78 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	69.04 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	72.97 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	62.56 KB (+0.01% 🔺)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	33.26 KB (+0.03% 🔺)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	33.15 KB (+0.01% 🔺)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	31.13 KB (0%)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	31.13 KB (0%)
@sentry/browser - Webpack (gzipped)	22.41 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	76.02 KB (-0.02% 🔽)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	67.53 KB (-0.02% 🔽)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	33.49 KB (-0.03% 🔽)
@sentry/browser - ES6 CDN Bundle (gzipped)	24.69 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	212.28 KB (-0.02% 🔽)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	101 KB (-0.03% 🔽)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	73.87 KB (0%)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	36.79 KB (-0.02% 🔽)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	69.34 KB (-0.01% 🔽)
@sentry/react - Webpack (gzipped)	22.44 KB (0%)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	86.82 KB (-0.01% 🔽)
@sentry/nextjs Client - Webpack (gzipped)	50.06 KB (-0.01% 🔽)
@sentry-internal/feedback - Webpack (gzipped)	17.16 KB (0%)