build: allow local modules/sentry-cocoa clone for development

[jpnurmi]

Motivation

1. Local development: To make it easier to develop locally against an unreleased version of the Sentry Cocoa SDK without reverting d179ec9 as done in WIP: Prevent Cocoa SDK from capturing errors that also get captured by .NET #4537
2. Integration testing: To be able to implement an integration test for [WIP] fix: interop with managed Mono/CoreCLR runtimes sentry-cocoa#6193, Sentry .NET would need to be able to run against an unreleased version of the Sentry Cocoa SDK
3. C# binding updates: To allow easier experimenting with C# bindings ahead of time for unreleased Sentry Cocoa SDK versions. Due to the ongoing efforts to convert Obj-C types to Swift, it would be nice to be able to test the impact on the C# bindings.

Instructions

To switch to local development mode, replace the pre-built Sentry Cocoa SDK in modules/sentry-cocoa with a clone of getsentry/sentry-cocoa:

$ rm -rf modules/sentry-cocoa
$ gh repo clone getsentry/sentry-cocoa modules/sentry-cocoa
$ dotnet build ...

To switch back to a pre-built Sentry Cocoa SDK, delete the modules/sentry-cocoa clone and let Sentry.Bindings.Cocoa.csproj download the version declared in modules/sentry-cocoa.properties:

$ rm -rf modules/sentry-cocoa
$ dotnet build ...

#skip-changelog (for internal development purposes only)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.33%. Comparing base (58b5da0) to head (0d4e77f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4551      +/-   ##
==========================================
- Coverage   73.37%   73.33%   -0.04%     
==========================================
  Files         479      479              
  Lines       17505    17505              
  Branches     3445     3445              
==========================================
- Hits        12844    12837       -7     
- Misses       3783     3787       +4     
- Partials      878      881       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.