fix(serverless): Capture custom tags in GCP Background and CloudEvent function error events

[Lms24]

Following up on #7222 and #7298 this PR fixes adding custom tags for GCP Background and CloudEvent function error events. As for Http functions, we also previously captured errors just via domain.on('error',...) which used the wrong domain, leading to tags (+other data) not being captured correctly. With this fix, we now also directly capture exceptions during function invocation.

ref #7222

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.11 KB (-0.02% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	62.49 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.74 KB (-0.01% 🔽)
@sentry/browser - ES6 CDN Bundle (minified)	55.5 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	20.48 KB (0%)
@sentry/browser - Webpack (minified)	66.94 KB (0%)
@sentry/react - Webpack (gzipped + minified)	20.51 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	48.04 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	27.04 KB (-0.01% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	25.29 KB (-0.01% 🔽)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	42.86 KB (-0.01% 🔽)
@sentry/replay - Webpack (gzipped + minified)	36.94 KB (0%)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	60.45 KB (-0.01% 🔽)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	53.99 KB (0%)