Fix markup style error if test contains [ or ]

[kzu]

This can happen for test theories, for example.

[devlooped-bot]

🧪 Details on macOS Unix 14.5.0

❌ Demo.Tests.Fails_With_Complex_StackTrace

   at Demo.Tests.Unexpected() in /_/src/Demo/Tests.cs:line 49
   at Demo.Tests.Run() in /_/src/Demo/Tests.cs:line 47
   at Demo.Tests.<Fails_With_Complex_StackTrace>b__6_0() in /_/src/Demo/Tests.cs:line 36
   at Demo.Tests.Fails_With_Complex_StackTrace() in /_/src/Demo/Tests.cs:line 38

❌ Demo.Tests.Fails_With_Output

   at Demo.Tests.Fails_With_Output() in /_/src/Demo/Tests.cs:line 30

> It was going so well...
> Yet you never know
> Which is why you sprinkle all these WriteLines 👀

❌ Demo.Tests.FailsOnlyOnUnix

   at Demo.Tests.FailsOnlyOnUnix() in /_/src/Demo/Tests.cs:line 45

✅ Demo.Tests.Parameterized(culture: "de")
✅ Demo.Tests.Parameterized(culture: "en")
✅ Demo.Tests.Parameterized(culture: "es")
✅ Demo.Tests.Parameterized(culture: "fr")
❔ Demo.Tests.Skipped_Test_Does_Not_Run => Shouldn't run for now :)

✅ Demo.Tests.Test_With_Output

> Hello, world from xunit ITestOutputHelper!

❔ Demo.Tests.WindowsOnlyTest => Test only runs on Win32NT

🧪 Details on Ubuntu 22.04.4 LTS

❌ Demo.Tests.Fails_With_Complex_StackTrace

   at Demo.Tests.Unexpected() in /_/src/Demo/Tests.cs:line 49
   at Demo.Tests.Run() in /_/src/Demo/Tests.cs:line 47
   at Demo.Tests.<Fails_With_Complex_StackTrace>b__6_0() in /_/src/Demo/Tests.cs:line 36
   at Demo.Tests.Fails_With_Complex_StackTrace() in /_/src/Demo/Tests.cs:line 38

❌ Demo.Tests.Fails_With_Output

   at Demo.Tests.Fails_With_Output() in /_/src/Demo/Tests.cs:line 30

> It was going so well...
> Yet you never know
> Which is why you sprinkle all these WriteLines 👀

❌ Demo.Tests.FailsOnlyOnUnix

   at Demo.Tests.FailsOnlyOnUnix() in /_/src/Demo/Tests.cs:line 45

✅ Demo.Tests.Parameterized(culture: "de")
✅ Demo.Tests.Parameterized(culture: "en")
✅ Demo.Tests.Parameterized(culture: "es")
✅ Demo.Tests.Parameterized(culture: "fr")
❔ Demo.Tests.Skipped_Test_Does_Not_Run => Shouldn't run for now :)

✅ Demo.Tests.Test_With_Output

> Hello, world from xunit ITestOutputHelper!

❔ Demo.Tests.WindowsOnlyTest => Test only runs on Win32NT

🧪 Details on Microsoft Windows 10.0.20348

❌ Demo.Tests.Fails_With_Complex_StackTrace

   at Demo.Tests.Unexpected() in /_/src/Demo/Tests.cs:line 49
   at Demo.Tests.Run() in /_/src/Demo/Tests.cs:line 47
   at Demo.Tests.<Fails_With_Complex_StackTrace>b__6_0() in /_/src/Demo/Tests.cs:line 36
   at Demo.Tests.Fails_With_Complex_StackTrace() in /_/src/Demo/Tests.cs:line 38

❌ Demo.Tests.Fails_With_Output

   at Demo.Tests.Fails_With_Output() in /_/src/Demo/Tests.cs:line 30

> It was going so well...
> Yet you never know
> Which is why you sprinkle all these WriteLines 👀

❔ Demo.Tests.FailsOnlyOnUnix => Test only runs on Unix
✅ Demo.Tests.Parameterized(culture: "de")
✅ Demo.Tests.Parameterized(culture: "en")
✅ Demo.Tests.Parameterized(culture: "es")
✅ Demo.Tests.Parameterized(culture: "fr")
❔ Demo.Tests.Skipped_Test_Does_Not_Run => Shouldn't run for now :)

✅ Demo.Tests.Test_With_Output

> Hello, world from xunit ITestOutputHelper!

✅ Demo.Tests.WindowsOnlyTest

> This test runs only on Windows

from dotnet-trx v42.42.199-pr36 on .NET 8.0.7 with 💜