feat(tracing): Rename registerRequestInstrumentation -> instrumentOutgoingRequests

[AbhiPrasad]

Running back #4859 as it was incorrectly merged to master. This should be merged in 7.x instead.

Renames registerRequestInstrumentation to instrumentOutgoingRequests.

See #3338 for context.

Resolves https://getsentry.atlassian.net/browse/WEB-608

[Lms24]

Wait, isn't this already in 7.x? see 244eb0e

[AbhiPrasad]

Ah it might have been cherry-picked on, good catch. Can close this then!

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.07 KB (-0.34% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	64.33 KB (-0.45% 🔽)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.79 KB (-0.36% 🔽)
@sentry/browser - ES6 CDN Bundle (minified)	57.71 KB (-0.44% 🔽)
@sentry/browser - Webpack (gzipped + minified)	23.04 KB (-0.84% 🔽)
@sentry/browser - Webpack (minified)	80.86 KB (-1.05% 🔽)
@sentry/react - Webpack (gzipped + minified)	23.08 KB (-0.83% 🔽)
@sentry/nextjs Client - Webpack (gzipped + minified)	47.84 KB (-0.45% 🔽)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	25.99 KB (-0.32% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	24.41 KB (-0.32% 🔽)