Support stack trace linking when stack frames do not contain line context.

[rodolfoBee]

Environment

SaaS (https://sentry.io/)

Version

No response

Link

No response

DSN

No response

Steps to Reproduce

Mirror of this internal issue.

1. Implement stack trace linking as detailed here: https://docs.sentry.io/product/integrations/source-code-mgmt/github/#stack-trace-linking
2. Send an event to Sentry that contains a stack trace but its frames do not have pre/post line context.

Expected Result

Sentry is able to provide a link to the correct file in Github.

Actual Result

No link available in the stack trace.

[getsantry]

Assigning to @getsentry/support for routing, due by Thursday, February 2nd at 17:00 (yyz). ⏲️

[getsantry]

Routing to @getsentry/ecosystem for triage, due by Friday, February 3rd at 5:00 pm (sfo). ⏲️

[vaind]

This would be very useful for .NET source link support which should land in symbolic & symbolicator in the near future. getsentry/symbolic#735

That way, we can provide the link coming from the PortablePDB without actually fetching the source code from it.