Inconsistencies in build output when adding a test project

# Describe the issue
Hi, I have been using this library for a while now and got the request from my boss to implement unit tests into our exisiting azure functions projects. When I ran the CI pipeline (after adding set unit test projects) all files in the /cs folder were gone in the published artifacts. However the build output would be inconsistent and every 5 or so builds on the same branch I would get the correct output and go on with building the project.

## Additional context
I got around this issue by adding a copy files task which copies all files from the bin folder to the root folder of the artifact.

# To Reproduce
Steps to reproduce the behavior:
1. Create new azure functions project
2. Create Xunit project
3. Disable Xunit in buildconfiguration for release as this caused conflicts as seen in: #306
4. Create CI pipeline with Xunit test step
5. Look at published artifact and see missing files (empty folders with missing files)

# Expected behavior
When building the artifact the build output should be consistent and the same each and every time.

# Screenshots
Left side what current artifact looks like, right side is what the artifact should look like. All files do exist on the left side but in the /bin folder which does not work when deploying the Azure Function to Azure using the `AzureFunctionApp@1` step.

# Environment (please complete the following information, if applicable):
- OS: Ubuntu latest pipeline
- .NET6 LTS
- Function V4

# Current pipeline (with fix)
```yml
name : ci-pipeline.yml
trigger:
branches:
include:
- main

pool:
vmImage: 'ubuntu-latest'

variables:
buildConfiguration: 'Release'

stages:
- stage: Build
displayName: Build solution

jobs:
- job: Build
displayName: Build and publish solution
workspace:
clean: all

steps:
- task: UseDotNet@2
displayName: Use Dot Net Core 6.0.x
inputs:
packageType: 'sdk'
version: '6.0.x'

- task: DotNetCoreCLI@2
displayName: 'Restore NuGet packages'
inputs:
command: restore
projects: "**/*.csproj"

- task: DotNetCoreCLI@2
displayName: 'Build API'
inputs:
command: build
arguments: '--configuration $(buildConfiguration)'

- task: DotNetCoreCLI@2
displayName: Run XUnit tests
inputs:
command: test
projects: '**/*.Tests.csproj'
arguments: '--configuration $(buildConfiguration)'

- task: DotNetCoreCLI@2
displayName: 'Create API Artifact'
inputs:
command: publish
arguments: '--output $(Build.ArtifactStagingDirectory)'
configuration: $(BuildConfiguration)
publishWebProjects: false
zipAfterPublish: false

- task: DeleteFiles@1
displayName: 'Remove runtimes folder'
inputs:
SourceFolder: $(Build.ArtifactStagingDirectory)/runtimes
Contents: '*'
RemoveSourceFolder: true

# This is the current fix I came up with
- task: CopyFiles@2
inputs:
sourceFolder: $(Build.ArtifactStagingDirectory)/bin
contents: '**'
targetFolder: $(Build.ArtifactStagingDirectory)
# Fix ends here

- task: ArchiveFiles@2
displayName: 'Zip API Artifact'
inputs:
rootFolderOrFile: '$(Build.ArtifactStagingDirectory)'
includeRootFolder: false
archiveType: 'zip'
archiveFile: '$(Build.ArtifactStagingDirectory)/$(Build.BuildId).zip'
replaceExistingArchive: true

- task: PublishPipelineArtifact@1
displayName: 'Publish API Artifact'
inputs:
targetPath: '$(Build.ArtifactStagingDirectory)/$(Build.BuildId).zip'
artifactName: 'ArtifactNameHere'
```