bug: mason registry verification fails #403

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Neovim version (nvim -v)

0.11.2

Operating system/version

Linux

Describe the bug

Invalid mason registry verification fails even when nvim-java registry is configured correctly.

This setup to exit early, preventing nvim-java from setting up correctly.

It happens because the startup check is performed before the registry is added to Mason.

I uncovered this issue while migrating that part to Mason 2.0.. It perhaps have been hiding behind the invalid_mason_registry verification being default disabled in the configuration.

The fix is extracting the registry setup code from java.startup.mason-dep.install into a separate function and calling it in java.setup prior to the startup check. I have a PR coming.

Steps To Reproduce

1. Enable invalid mason registry verification:

require('java').setup {
    verification = { invalid_mason_registry = true }
}

2. Start Neovim
3. The following text error message is printed:

nvim-java mason registry is not added correctly!                                                                                              
This occurs when mason.nvim configured incorrectly                                                                                            
Please refer the link below to fix the issue                                                                                                  
https://github.com/nvim-java/nvim-java/wiki/Q-&-A#no_entry-cannot-find-package-xxxxx 

Expected Behavior

Neovim starts without error messages regarding mason repository verification.