Disable Mason Java and Julia dependencies

[josh]

Summary

• remove the Java (OpenJDK) and Julia packages from Mason extra packages to avoid pulling Java runtimes
• ignore Mason health warnings for missing Java, Javac, and Julia binaries since they are intentionally absent

Testing

• nix flake check --accept-flake-config --show-trace --print-build-logs --keep-going

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Codex Task

[Copilot]

Pull Request Overview

This PR removes Java (OpenJDK) and Julia runtime dependencies from Mason to avoid pulling unnecessary heavy runtimes into the Neovim environment.

• Removed jdk and julia from the Nix package imports and Mason's extraPackages
• Replaced conditional Julia warning ignoring with static warning suppressions for java, javac, and julia binaries
• Cleaned up unused imports (lib, stdenv, julia) from test and LazyVim configuration files

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
plugins.nix	Removed jdk and julia from imports and Mason's extraPackages list, eliminating conditional Julia platform availability logic
pkgs/tests/mason-nvim-checkhealth.nix	Removed unused imports and converted ignoreLines to static list of warnings for intentionally missing java, javac, and julia binaries
pkgs/LazyVim.nix	Removed unused imports and updated Mason checkhealth test to ignore warnings for intentionally absent java, javac, and julia binaries

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