[GR-47647] [GR-47928] [GR-47692] Fix and improve experimental option handling.

[graalvmbot]

Example

$ native-image -m jdk.httpserver --gc=epsilon -H:EnableMonitoringFeatures=all
Warning: The option '-H:EnableMonitoringFeatures=all' is experimental and must be enabled via '-H:+UnlockExperimentalVMOptions' in the future.
Warning: Please re-evaluate whether any experimental option is required, and either remove or unlock it. The build output lists all active experimental options, including where they come from and possible alternatives. If you think an experimental option should be considered as stable, please file an issue.
========================================================================================================================
GraalVM Native Image: Generating 'jdk.httpserver' (executable)...
========================================================================================================================
[1/8] Initializing...                                                                                    (4.1s @ 0.17GB)
 Java version: 21+33, vendor version: Oracle GraalVM 21-dev+33.1
 Graal compiler: optimization level: 2, target machine: x86-64-v3
 C compiler: gcc (linux, x86_64, 12.3.0)
 Garbage collector: Epsilon GC (max heap size: 80% of RAM)
 1 user-specific feature(s):
 - com.oracle.svm.thirdparty.gson.GsonFeature
------------------------------------------------------------------------------------------------------------------------
 1 experimental option(s) unlocked:
 - '-H:EnableMonitoringFeatures' (alternative API option(s): --enable-monitoring=all; origin(s): command line)
------------------------------------------------------------------------------------------------------------------------

Previously

$ native-image -m jdk.httpserver --gc=epsilon -H:EnableMonitoringFeatures=all
Warning: The option '-H:EnableMonitoringFeatures=all' is experimental and must be enabled via -H:+UnlockExperimentalVMOptions in the future.
Warning: Please re-evaluate whether any experimental option is required, and either remove or unlock it. The build output lists all active experimental options, including where they come from and possible alternatives. If you think an experimental option should be considered as stable, please file an issue.
========================================================================================================================
GraalVM Native Image: Generating 'jdk.httpserver' (executable)...
========================================================================================================================
[1/8] Initializing...                                                                                    (4.7s @ 0.17GB)
 Java version: 21+33, vendor version: Oracle GraalVM 21-dev+33.1
 Graal compiler: optimization level: 2, target machine: x86-64-v3
 C compiler: gcc (linux, x86_64, 12.3.0)
 Garbage collector: Epsilon GC (max heap size: 80% of RAM)
 1 user-specific feature(s):
 - com.oracle.svm.thirdparty.gson.GsonFeature
------------------------------------------------------------------------------------------------------------------------
 2 Experimental option(s) in use:
 -H:-UseSerialGC
   Origin: command line
 -H:EnableMonitoringFeatures
   Origin: command line
   Alternative API option(s): --enable-monitoring=all
------------------------------------------------------------------------------------------------------------------------