Is your feature request related to a problem? Please describe it.
Every time I start up Neovim, I get the message latexmk is not executable. I don't use latexmk (or bibtex, or any such program), and I'm using VimTeX only for its syntax highlighting. So, this message is superfluous to me (especially I work fine without it).
Describe the solution you'd like
Allow an option disabling the startup error messages.
Additional context
I tried let g:vimtex_compiler_enabled=0, but the messages still show up.