new references pushed to a git repository can be validated on the spot by custom code (in the form of a WebAssembly module)

This is the continuation of story #28845, it consist of doing the same actions as the tuleap git:pre-receive-analyze command, but instead of performing the reference analysis retroactively, to do it right away when new references are pushed, like a Git pre-receive hook

• a git pre-receive hook installed on every git repository is in charge of calling PHP code to check if a WASM module is setup for the repository where a push is happening, if that's the case it executes the WASM module
• when a WASM module is executed, it either exits without any output with the exit code 0 if everything is expected or with a message and an exit code 1 if the objects should be rejected
• If no module is setup for a repository the pre-receive hook systematically return 0 to accept the incoming changes
• there is no way to upload a WASM module at this time, the files must be put at a specific path on the filesystem (/var/lib/tuleap/untrusted-code/git/pre-receive-hook/<repo-id>.wasm)
• when all of the above is functional, the tuleap git:pre-receive-analyze is removed as this feature supersedes the command