gradle: add support for the new file events library

[msfjarvis]

Gradle 8.12 (currently in release candidate phase) switches from the old file-events library to a new one that has a different name. The update is yet to land in Nixpkgs but this prepares us in advance.

I've tested that I can build Gradle 8.12 RC1 with this change by adding the following to all-packages.nix:

gradle_8_12 = wrapGradle (callPackage (gradleGen { version = "8.12-rc-1"; hash = "sha256-TZ161M+IQvJ5ZJIT0vh9j36aA651rEOJUXqldLFASyo="; defaultJava = jdk23; }) {}) null;

I've also confirmed that Gradle 7 and 8 continue to build as before, I have nixpkgs-review still running just in case I've angered the gods somehow.

Looks like this PR will conflict with #356109 so I'm okay to wait it out if that is going to be merged soon.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[msfjarvis]

Gradle 8.12 is out now so this is required to use pkgs.gradleGen out of tree as well, is there anything blocking the merging of the PR?

[liff]

I’ve cherry-picked these changes into #356109.

[msfjarvis]

Thanks! Closing since it's superseded by #356109