Feature Request: Set default in java.configuration.runtimes to the workspace environment variable JAVA_HOME

[cypher256]

Currently, the default of the Java extension java.configuration.runtimes is used as the default for No Build Tools, but it would be useful to set it to the environment variable JAVA_HOME which is valid for each workspace. The environment variable here is not the terminal, but process.env.JAVA_HOME, which is referenced by extensions such as

• java.import.gradle.java.home
  Setting > java.jdt.ls.java.home > JAVA_HOME > PATH
• maven.terminal.customEnv
  Setting > JAVA_HOME
• java.jdt.ls.java.home
  Setting > Embedded JRE > JDK_HOME > JAVA_HOME > PATH
• spring-boot.ls.java.home
  Setting > Embedded JRE > JAVA_HOME > PATH
• rsp-ui.rsp.java.home
  Setting > JDK_HOME > JAVA_HOME> Windows Registry > PATH
• salesforcedx-vscode-apex.java.home
  Setting > JDK_HOME > JAVA_HOME> Windows Registry > PATH
• plantuml.java
  Setting > PATH

The goal is to be able to use a different JAVA_HOME for each workspace, independent of the system's JAVA_HOME environment variable. For example:

User settings.json

"java.configuration.runtimes": [
	{
		"name": "JavaSE-17",
		"path": "/path/to/java/17",
		"default": true
	},
	{
		"name": "JavaSE-21",
		"path": "/path/to/java/21",
	}
],

Workspace settings.json (Override default runtime to JavaSE-21)

"java.configuration.runtimes": [
	{
		"name": "JavaSE-21",
		"path": "/path/to/java/21",
		"default": true
	}
],

java.configuration.runtimes is a Red Hat extension, but I am posting it here because I believe it needs to be supported by VSCode itself. It is related to the following issues.
#152806 API: allow an extension to change the environment variables