Project discovery raises concurrency related errors

[dupdob]

          Unfortunately I still got an error with 4.4.1:

Run cd Tests
  cd Tests
  ../../tools/dotnet-stryker -f ../.github/stryker/Stryker.Config.Testing.json -v "${GITHUB_HEAD_REF}" -r "Dashboard" -r "html" -r "cleartext" --since:main
  mv ./StrykerOutput/**/reports/*.html ./StrykerOutput/Reports/Testably.Abstractions.Testing-report.html
  shell: /usr/bin/bash --noprofile --norc -e -o pipefail {0}
  env:
    DOTNET_ROOT: /usr/share/dotnet
    STRYKER_DASHBOARD_API_KEY: ***

   _____ _              _               _   _ ______ _______  
  / ____| |            | |             | \ | |  ____|__   __| 
 | (___ | |_ _ __ _   _| | _____ _ __  |  \| | |__     | |    
  \___ \| __| '__| | | | |/ / _ \ '__| | . ` |  __|    | |    
  ____) | |_| |  | |_| |   <  __/ |    | |\  | |____   | |    
 |_____/ \__|_|   \__, |_|\_\___|_| (_)|_| \_|______|  |_|    
                   __/ |                                      
                  |___/                                       


Version: 4.4.1

[19:31:56 INF] Analysis starting.
[19:31:56 INF] Analyzing 2 test project(s).
[19:32:04 INF] Analysis complete.
[19:32:04 ERR] An error occurred during the mutation test run 
System.InvalidOperationException: Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.
   at Stryker.Core.Initialisation.InputFileResolver.AnalyzeAllNeededProjects(List`1 projectList, IStrykerOptions options, IAnalyzerManager manager, ScanMode mode)
   at Stryker.Core.Initialisation.InputFileResolver.AnalyzeAndIdentifyProjects(List`1 projectList, IStrykerOptions options, IAnalyzerManager manager, ScanMode mode)
   at Stryker.Core.Initialisation.InputFileResolver.ResolveSourceProjectInfos(IStrykerOptions options)
   at Stryker.Core.Initialisation.InitialisationProcess.GetMutableProjectsInfo(IStrykerOptions options)
   at Stryker.Core.Initialisation.ProjectOrchestrator.MutateProjects(IStrykerOptions options, IReporter reporters, ITestRunner runner)
   at Stryker.Core.StrykerRunner.RunMutationTest(IStrykerInputs inputs, ILoggerFactory loggerFactory, IProjectOrchestrator projectOrchestrator)
[19:32:04 INF] Time Elapsed 00:00:09.0750260
Unhandled exception. System.InvalidOperationException: Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.
   at Stryker.Core.Initialisation.InputFileResolver.AnalyzeAllNeededProjects(List`1 projectList, IStrykerOptions options, IAnalyzerManager manager, ScanMode mode)
   at Stryker.Core.Initialisation.InputFileResolver.AnalyzeAndIdentifyProjects(List`1 projectList, IStrykerOptions options, IAnalyzerManager manager, ScanMode mode)
   at Stryker.Core.Initialisation.InputFileResolver.ResolveSourceProjectInfos(IStrykerOptions options)
   at Stryker.Core.Initialisation.InitialisationProcess.GetMutableProjectsInfo(IStrykerOptions options)
   at Stryker.Core.Initialisation.ProjectOrchestrator.MutateProjects(IStrykerOptions options, IReporter reporters, ITestRunner runner)
   at Stryker.Core.StrykerRunner.RunMutationTest(IStrykerInputs inputs, ILoggerFactory loggerFactory, IProjectOrchestrator projectOrchestrator)
   at Stryker.CLI.StrykerCli.RunStryker(IStrykerInputs inputs) in /_/src/Stryker.CLI/Stryker.CLI/StrykerCLI.cs:line 152
   at Stryker.CLI.StrykerCli.<>c__DisplayClass11_0.<Run>b__0() in /_/src/Stryker.CLI/Stryker.CLI/StrykerCLI.cs:line 124
   at McMaster.Extensions.CommandLineUtils.CommandLineApplication.<>c__DisplayClass143_0.<OnExecute>b__0(CancellationToken _)
   at McMaster.Extensions.CommandLineUtils.CommandLineApplication.ExecuteAsync(String[] args, CancellationToken cancellationToken)
   at McMaster.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args)
   at Stryker.CLI.StrykerCli.Run(String[] args) in /_/src/Stryker.CLI/Stryker.CLI/StrykerCLI.cs:line 130
   at Stryker.CLI.Program.Main(String[] args) in /_/src/Stryker.CLI/Stryker.CLI/Program.cs:line 14
/home/runner/work/_temp/5b14c011-54cb-4878-9862-bf600e6ec71f.sh: line 2:  2200 Aborted                 (core dumped) ../../tools/dotnet-stryker -f ../.github/stryker/Stryker.Config.Testing.json -v "${GITHUB_HEAD_REF}" -r "Dashboard" -r "html" -r "cleartext" --since:main
Error: Process completed with exit code 134.

Originally posted by @vbreuss in #3103 (comment)