fix(otel): Add trace info to error events

[AbhiPrasad]

Follows spec as is outlined here: https://develop.sentry.dev/sdk/performance/opentelemetry/#step-1-implement-the-sentryspanprocessor-on-your-sdk

Uses the logic from the baseclient here:

sentry-javascript/packages/core/src/scope.ts

Lines 473 to 482 in 8139853

	// We want to set the trace context for normal events only if there isn't already
	// a trace context on the event. There is a product feature in place where we link
	// errors with transaction and it relies on that.
	if (this._span) {
	event.contexts = { trace: this._span.getTraceContext(), ...event.contexts };
	const transactionName = this._span.transaction && this._span.transaction.name;
	if (transactionName) {
	event.tags = { transaction: transactionName, ...event.tags };
	}
	}

Attach trace context info from active transaction to errors in an event processor. Couple things to note.

1. This attaches the trace context to all events. Transactions should be setting their own trace context, and that will override this via the spread operator
2. We don't use scope at all here - we are relying on identifying the active span via opentelemetry.

Supercedes approach from #6349 since we don't want to rely on scope.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.57 KB (-0.02% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	60.59 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.36 KB (+0.02% 🔺)
@sentry/browser - ES6 CDN Bundle (minified)	54.15 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	20.12 KB (0%)
@sentry/browser - Webpack (minified)	65.75 KB (0%)
@sentry/react - Webpack (gzipped + minified)	20.14 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	45.97 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	26.42 KB (-0.01% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	24.85 KB (+0.02% 🔺)
@sentry/replay index.js	37.2 KB (+0.02% 🔺)
@sentry/replay - Webpack (gzipped + minified)	37.18 KB (+0.02% 🔺)
@sentry/replay - Webpack (minified)	124.99 KB (+0.01% 🔺)