Fix routing of plugins public PHP scripts

[cedric-anne]

Checklist before requesting a review

• I have read the CONTRIBUTING document.
• I have performed a self-review of my code.
• I have added tests that prove my fix is effective or that my feature works.

Description

In GLPI 11.0, a request to /plugins/myplugin/myscript.php should serve the /plugins/myplugin/public/myscript.php file and the default firewall strategy should be the same as any other legacy PHP script of the plugin.

This PR:

• fixes the default strategy applied to /public/*.php scripts,
• handles URLs explicitely containing the /public path, but triggers a deprecation indicating that /public should not be present in the URL (URL /plugins/myplugin/public/myscript.php shoudl be replaced by /plugins/myplugin/myscript.php).

[trasher]

Not tested, but seems technically OK.

From my point of view, there should be no PHP scripts in public directory though.

[tsmr]

tests ok

[cedric-anne]

From my point of view, there should be no PHP scripts in public directory though.

I agree. It is just to handle legacy PHP scripts that were not in the ajax/front directory of the plugin. They can be moved in the public directory to make the migration easier (no need to change the URLs), but they will have to be converted in a Symfony controller in the long term.