Provide better guidance on suitable test commands for java project

In telemetry I've seen a user struggle ultimately without success to provide correct test commands with java (log anonymized):

g:\My Data\_My Documents\_FIRST\ABC\Visual Studio Code\Test Project
===
{}
===
'g:\My' is not recognized as an internal or external command,
operable program or batch file.

g:\My Data\_My Documents\_FIRST\ABC\Visual Studio Code\Test Project
===
{}
===
'g:\My' is not recognized as an internal or external command,
operable program or batch file.

"C:\Program Files\Amazon Corretto\jdk11.0.14_9\bin\java.exe" "-agentlib:jdwp=transport=dt_socket,server=n,suspend=y,address=localhost:60986" "-Djava.library.path=G:\My Data\_My Documents\_FIRST\ABC\Visual Studio Code\Test Project\build\jni\release" "@C:\Users\user\AppData\Local\Temp\cp_af3mtaoo5kd0r4lrhj2jj5hwd.argfile" "ABC.robot.Main"
===
{}
===

"C:\Program Files\Amazon Corretto\jdk11.0.14_9\bin\java.exe" "-agentlib:jdwp=transport=dt_socket,server=n,suspend=y,address=localhost:60986" "-Djava.library.path=G:\My Data\_My Documents\_FIRST\ABC\Visual Studio Code\Test Project\build\jni\release" "@C:\Users\user\AppData\Local\Temp\cp_af3mtaoo5kd0r4lrhj2jj5hwd.argfile" "ABC.robot.Main"
===
{}
===
ERROR: transport error 202: connect failed: Connection refused
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [./src/jdk.jdwp.agent/share/native/libjdwp/debugInit.c:735]

"C:\Program Files\Amazon Corretto\jdk11.0.14_9\bin\java.exe" "-agentlib:jdwp=transport=dt_socket,server=n,suspend=y,address=localhost:60986" "-Djava.library.path=G:\My Data\_My Documents\_FIRST\ABC\Visual Studio Code\Test Project\build\jni\release" "@C:\Users\user\AppData\Local\Temp\cp_af3mtaoo5kd0r4lrhj2jj5hwd.argfile" "ABC.robot.Main"
===
{}
===
ERROR: transport error 202: connect failed: Connection refused
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [./src/jdk.jdwp.agent/share/native/libjdwp/debugInit.c:735]

C:\Program Files\Amazon Corretto\jdk11.0.14_9\bin\java.exe -agentlib:jdwp=transport=dt_socket,server=n,suspend=y,address=localhost:60986 -Djava.library.path=G:\My Data\_My Documents\_FIRST\ABC\Visual Studio Code\Test Project\build\jni\release @C:\Users\user\AppData\Local\Temp\cp_af3mtaoo5kd0r4lrhj2jj5hwd.argfile ABC.robot.Main
===
{}
===
'C:\Program' is not recognized as an internal or external command,
operable program or batch file.

"C:\Program Files\Amazon Corretto\jdk11.0.14_9\bin\java.exe" "-Djava.library.path=G:\My Data\_My Documents\_FIRST\ABC\Visual Studio Code\Test Project\build\jni\release" "@C:\Users\user\AppData\Local\Temp\cp_af3mtaoo5kd0r4lrhj2jj5hwd.argfile" "ABC.test.Main"
===
{}
===
HAL Extensions: No extensions found
,********** Test program starting **********
,NT: ERROR: bind() to port 1735 failed: Only one usage of each socket address (protocol/network address/port) is normally permitted.
(TCPAcceptor.cpp:120)
,********** Test program startup complete **********

I'm not sure how handling of test commands work for Java, which requires a javaagent argument added, but it seems to me none of these invocations is correct. You can also see the user struggling with understanding what they need to provide (just the directory? do I need the path to the java runtime? do I need the entire command line?) and with handling spaces (we could validate the input a bit to make this easier).

No file or test entry point is named. Start by tracing how Java test commands and paths are collected and executed, then reproduce the Windows examples with spaces and Java agent arguments. Done means users receive clear guidance about the expected input and invalid or ambiguous commands are handled more helpfully.