chore: bump Microsoft.NET.Test.Sdk to v18.x

[vbreuss]

This PR updates the Microsoft.NET.Test.Sdk package from version 17.14.0 to 18.0.1, addressing compatibility requirements for the newer SDK version by suppressing target framework support build errors in test projects.

• Bumped Microsoft.NET.Test.Sdk from v17.14.0 to v18.0.1
• Added SuppressTfmSupportBuildErrors property to prevent build errors related to target framework compatibility

[Copilot]

Pull Request Overview

This PR updates the Microsoft.NET.Test.Sdk package from version 17.14.0 to 18.0.1, addressing compatibility requirements for the newer SDK version by suppressing target framework support build errors in test projects.

• Bumped Microsoft.NET.Test.Sdk from v17.14.0 to v18.0.1
• Added SuppressTfmSupportBuildErrors property to prevent build errors related to target framework compatibility

Reviewed Changes

Copilot reviewed 2 out of 6 changed files in this pull request and generated 1 comment.

File	Description
Directory.Packages.props	Updated Microsoft.NET.Test.Sdk package version to 18.0.1
tests/Directory.Build.props	Added SuppressTfmSupportBuildErrors property to handle TFM compatibility issues with the new SDK version

Files not reviewed (4)

• .idea/.idea.System.IO.Abstractions/.idea/copilot.data.migration.agent.xml: Language not supported
• .idea/.idea.System.IO.Abstractions/.idea/copilot.data.migration.ask.xml: Language not supported
• .idea/.idea.System.IO.Abstractions/.idea/copilot.data.migration.ask2agent.xml: Language not supported
• .idea/.idea.System.IO.Abstractions/.idea/copilot.data.migration.edit.xml: Language not supported

[github-actions]

Test Results

   23 files   -     8     23 suites   - 8   8s ⏱️ -6s
1 043 tests  -   108    922 ✅  -   228  121 💤 +120  0 ❌ ±0 
6 745 runs   - 4 312  6 024 ✅  - 4 194  721 💤  - 118  0 ❌ ±0 

Results for commit 88e1795. ± Comparison against base commit 9caf7a1.

This pull request removes 108 tests.

System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryInfoTests ‑ MockDirectoryInfo_Exists("c:\\temp\\folder",True)
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryInfoTests ‑ MockDirectoryInfo_Exists("c:\\temp\\folder\\notExistant",False)
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryInfoTests ‑ MockDirectoryInfo_GetExtension_ShouldReturnEmptyString("c:\\temp")
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryInfoTests ‑ MockDirectoryInfo_GetExtension_ShouldReturnEmptyString("c:\\temp\\")
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryTests ‑ MockDirectory_EnumerateDirectories_ShouldReturnPathsPrefixedWithQueryPath("Folder","Folder\\SubFolder")
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryTests ‑ MockDirectory_EnumerateDirectories_ShouldReturnPathsPrefixedWithQueryPath("Folder\\","Folder\\SubFolder")
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryTests ‑ MockDirectory_EnumerateDirectories_ShouldReturnPathsPrefixedWithQueryPath("Folder\\..\\.\\Folder","Folder\\..\\.\\Folder\\SubFolder")
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryTests ‑ MockDirectory_Move_ShouldMoveDirectories("A:\\folder1\\","A:\\folder3\\","file.txt","folder2\\file2.txt")
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryTests ‑ MockDirectory_Move_ShouldMoveDirectories("A:\\folder1\\","a:\\folder3\\","file.txt","Folder2\\fiLe2.txt")
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryTests ‑ MockDirectory_Move_ShouldMoveDirectories("A:\\folder1\\","a:\\folder3\\","file.txt","Folder2\\file2.txt")
…

This pull request skips 120 tests.

System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryGetAccessControlTests ‑ MockDirectory_GetAccessControl_ShouldReturnAccessControlOfDirectoryData
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryGetAccessControlTests ‑ MockDirectory_GetAccessControl_ShouldThrowArgumentExceptionIfPathContainsOnlyWhitespaces("   ")
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryGetAccessControlTests ‑ MockDirectory_GetAccessControl_ShouldThrowArgumentExceptionIfPathContainsOnlyWhitespaces(" ")
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryGetAccessControlTests ‑ MockDirectory_GetAccessControl_ShouldThrowDirectoryNotFoundExceptionIfDirectoryDoesNotExistInMockData
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryInfoAccessControlTests ‑ MockDirectoryInfo_GetAccessControl_ShouldReturnAccessControlOfDirectoryData
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryInfoAccessControlTests ‑ MockDirectoryInfo_SetAccessControl_ShouldSetAccessControlOfDirectoryData
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryInfoTests ‑ Directory_exists_after_creation_with_security
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryInfoTests ‑ MockDirectoryInfo_FullName_ShouldReturnNormalizedUNCPath("\\\\unc/folder\\\\foo","\\\\unc\\folder\\foo")
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryInfoTests ‑ MockDirectoryInfo_FullName_ShouldReturnNormalizedUNCPath("\\\\unc\\folder","\\\\unc\\folder")
System.IO.Abstractions.TestingHelpers.Tests.MockDirectoryInfoTests ‑ MockDirectoryInfo_FullName_ShouldReturnPathWithTrimmedTrailingSpaces("c:\\temp\\folder  ","c:\\temp\\folder")
…

♻️ This comment has been updated with latest results.