Improved configuration for Installed PHPs

[quilix]

Is your feature request related to a problem? Please describe.

My issue is related to the configuration of the Installed PHPs interpreters.

In 'Windows | Preferences | PHP | Installed PHPs' you can configure the available
PHP interpreters by pressing the Add button. The window that appears allows you to set
the interpreter and the configuration files read by it.

• Issue 1
  The label of the checkbox "Use system default php.ini configuration" should
  be changed to something more suggestive. The actual label makes explicit
  reference to the name php.ini. Nothing in this label sugggests that this
  checkbox is related to the "Additional .ini files parsed" by the
  interpreter. The php interpreter itself prints "Additional .ini files
  parsed:" when run with the --ini option and this checkbox controls exactly this
  set of files.

• Issue 2
  The options in this window allow us to configure the execution environment of the PHP
  interpreter by specifying the php.ini file and providing some degree (but not complete) of
  control over the "Additional .ini file parsed".

  These execution environments will be referenced when creating Run Configurations.

  Let's assume the following:

  • I have configured a PHP interpreter that loads only the file php.ini.
  • I have a script main.php that I want to debug.

  Because the debugger is not loaded, I have to create a new Run Configuration and specify
  through PHP_INI_SCAN_DIR to scan a directory that contains the file xdebug.ini that in turn
  loads xdebug.so.

  This is the only way of doing that. It is not possible to use the checkbox "Use
  system default php.ini configuration" because the interpreter could load more
  files that I want.

  Now, if I create another file, let's call it webpage.php, and I want to debug it
  I have to create a run configuration for it and specify again to load xdebug.ini.

  It would be more convenient if we could add a PHP interpreter and specify all
  additional ini files that must be loaded.

  In this way I could create two configurations:

  • PHP - no debug that loads only the file php.ini;
  • PHP - with debug that loads both php.ini and xdebug.ini;

  Then the Run Configurations of main.php and webpage.php would reference
  these configurations without the need of specifying PHP_INI_SCAN_DIR each time
  in the run configuration of a script that I want to to debug.

Is this feature require new UI elements or modify existing?

In 'Windows | Preferences | PHP | Installed PHPs / Add... "
* Change the label of the checkbox "Use system default php.ini configuration"
* Allow to set the contents of PHP_INI_SCAN_DIR.

Describe the solution you'd like
... see above

Describe alternatives you've considered
No to attain what I want, that is to launch a PHP interpeter that loads xdebug.ini I've created the following script:

---- begin php8.2-dbg-only.sh ----
PHP_INI_SCAN_DIR=/home/bob//php/tools/additional-ini-debug /usr/bin/php8.2 "$@"
---- php8.2-dbg-only.sh ----

And I configure this script in Installed PHPs.

Additional context
Add any other context or screenshots about the feature request here.