Merge sharp dui3/alpha -> sdk main

[JR-Morgan]

Manual Merge from dui3/alpha, mostly containing specklesystems/speckle-sharp#3562
Some quick fixes (nullability syntax)
I've also tweaked the way we tell polysharp to create the IsExternalInit... this will allow us to use it in Core.. but may potentially stop us using in the test projects. I figured this was a better way round...

[gitguardian]

⚠️ GitGuardian has uncovered 1 secret following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
455155	Triggered	Generic Password	b1e69e6	tests/Speckle.Core.Tests.Integration/Fixtures.cs	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Understand the implications of revoking this secret by investigating where it is used in your code.
2. Replace and store your secret safely. Learn here the best practices.
3. Revoke and rotate this secret.
4. If possible, rewrite git history. Rewriting git history is not a trivial act. You might completely break other contributing developers' workflow and you risk accidentally deleting legitimate data.

To avoid such incidents in the future consider

• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

---

^{🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.}

[codecov]

Codecov Report

Attention: Patch coverage is 18.92393% with 437 lines in your changes missing coverage. Please review.

Project coverage is 27.43%. Comparing base (29e7e84) to head (02c396d).

Files	Patch %	Lines
...peckle.Core/Api/GraphQL/Resources/ModelResource.cs	4.91%	58 Missing ⚠️
...ckle.Core/Api/GraphQL/Resources/VersionResource.cs	5.08%	56 Missing ⚠️
...ckle.Core/Api/GraphQL/Resources/ProjectResource.cs	5.35%	53 Missing ⚠️
...ckle.Core/Api/GraphQL/Resources/CommentResource.cs	5.76%	49 Missing ⚠️
...e.Core/Api/GraphQL/Resources/ActiveUserResource.cs	8.82%	31 Missing ⚠️
...Core/Api/GraphQL/Resources/SubscriptionResource.cs	15.62%	26 Missing and 1 partial ⚠️
src/Speckle.Core/Api/GraphQL/Client.cs	70.11%	25 Missing and 1 partial ⚠️
...c/Speckle.Core/Api/GraphQL/Inputs/ProjectInputs.cs	0.00%	26 Missing ⚠️
...ore/Api/GraphQL/Resources/ProjectInviteResource.cs	11.11%	24 Missing ⚠️
...le.Core/Api/GraphQL/Resources/OtherUserResource.cs	11.53%	23 Missing ⚠️
... and 11 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   27.78%   27.43%   -0.35%     
==========================================
  Files         358      373      +15     
  Lines       14190    14483     +293     
  Branches     1388     1400      +12     
==========================================
+ Hits         3943     3974      +31     
- Misses       9976    10236     +260     
- Partials      271      273       +2     

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

[adamhathcock]

I feel like we can move this to the DIrectory.Build.Props file?

[JR-Morgan]

We only need this for the projects that core has InternalsVisibleTo attributes declared on. So technically not all test projects will need this. But.. if you think its simpler, I don't mind adding it there.

[adamhathcock]

Nah, let's not too that. I'd rather not have InternalsVisibileTo anyway but can avoid it for now