[ProcessLauncher] Fix Child Proc Arg Validation

[mdh1418]

It's stated that none of the process-id, name, or diagnostic-port options should be configured when launching a child process with dotnet-trace collect ... -- <child process to launch>, yet the check only errors when all are configured.

Additionally makes the exclusive check on process-id, name, diagnosic-port, and dsrouter more readable.

Before

SUCCESS
PS C:\Users\mihw\source\repos\mdh1418\diagnostics\latest> .\artifacts\bin\dotnet-trace\Debug\net8.0\dotnet-trace.exe collect -p 1418 --show-child-io  -- dotnet package search json
The runtime has been configured to pause during startup and is awaiting a Diagnostics IPC ResumeStartup command from a Diagnostic Port.
DOTNET_DiagnosticPorts="dotnet-trace-26020-20250616_135956.socket,suspend,connect"
DOTNET_DefaultDiagnosticPortSuspend=0

FAIL
PS C:\Users\mihw\source\repos\mdh1418\diagnostics\latest> .\artifacts\bin\dotnet-trace\Debug\net8.0\dotnet-trace.exe collect -p 1418 --show-child-io -n mihw --dport whim  -- dotnet package search json
None of the --name, --process-id, or --diagnostic-port options may be specified when launching a child process.

SUCCESS
PS C:\Users\mihw\source\repos\mdh1418\diagnostics\latest> .\artifacts\bin\dotnet-trace\Debug\net8.0\dotnet-trace.exe collect -p 1418 --show-child-io -n mihw  -- dotnet package search json             
The runtime has been configured to pause during startup and is awaiting a Diagnostics IPC ResumeStartup command from a Diagnostic Port.
DOTNET_DiagnosticPorts="dotnet-trace-27244-20250616_140018.socket,suspend,connect"
DOTNET_DefaultDiagnosticPortSuspend=0

After

FAIL
PS C:\Users\mihw\source\repos\mdh1418\diagnostics\latest> .\artifacts\bin\dotnet-trace\Debug\net8.0\dotnet-trace.exe collect -p 1418 --show-child-io  -- dotnet package search json                 
None of the --name, --process-id, or --diagnostic-port options may be specified when launching a child process.

FAIL
PS C:\Users\mihw\source\repos\mdh1418\diagnostics\latest> .\artifacts\bin\dotnet-trace\Debug\net8.0\dotnet-trace.exe collect -p 1418 --show-child-io -n mihw --dport whim  -- dotnet package search json
None of the --name, --process-id, or --diagnostic-port options may be specified when launching a child process.

FAIL
PS C:\Users\mihw\source\repos\mdh1418\diagnostics\latest> .\artifacts\bin\dotnet-trace\Debug\net8.0\dotnet-trace.exe collect -p 1418 --show-child-io -n mihw  -- dotnet package search json         
None of the --name, --process-id, or --diagnostic-port options may be specified when launching a child process.