Add ReportAssembliesMode in favor of ReportAssemblies

[GeertvanHorrik]

Fixes #1072

Introduces the InformationalVersionAttribute in favor of ReportAssemblies, covered by unit tests.

A few additional changes:

1. Added additional null check for assemblies
2. Moved retrieving the informational version attribute to try/catch since it was failing on the unit tests for NET461

Technically the GetName() can be optimized inside the foreach loop (only needed when value = in the MainSentryEventProcessor, but wasn't sure if it was worth less-readable code vs this optimization. Let me know if you would like this to be changed. For now this value is also used to determine whether an assembly should be checked / added at all.

Looking forward to your review. Have a great day!

[bruno-garcia]

Perfect. Thanks!

[bruno-garcia]

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

### Features

* Add ReportAssembliesMode in favor of ReportAssemblies([#1079](https://github.com/getsentry/sentry-dotnet/pull/1079))

[GeertvanHorrik]

Done, thanks for the fast review!

[bruno-garcia]

Seems like we have some failing tests @GeertvanHorrik

Can you repro them locally if you run all tests?

[GeertvanHorrik]

That's my bad, sorry. I though returning string.Empty is better than null to prevent potential null reference exceptions. Will fix.

[GeertvanHorrik]

Turning the tests back into their original behavior, but I am not sure if they are correct. At the moment, the informational version returns string.Empty (""), and that is being respected as null version. But I think it should fallback to the real assembly version in such case?

Maybe that's something to think about for a separate ticket. I will revert the old behavior back and respect a string.empty return from the informational version.

[bruno-garcia]

I spotted one thing we might need to change

[bruno-garcia]

Sorry for adding more comments but I think we should consider one more thing

[bruno-garcia]

@GeertvanHorrik Thanks for your contributions. I'll change the minor items I suggested and release it