ci: optimize install_homebrew_deps by coalescing installs #4975
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There seems to be a couple seconds overhead for each "brew install". Refactor install_homebrew_deps.bash to first assemble the list of all packages to install, and then do a single
brew installfor the whole list.Also remove mention of packages that are pre-installed on the Mac GHA runners or that we don't need.
In the process, by using the
OIIO_BREW_INSTALL_PACKAGESvariable and only setting it if empty, we now have the ability to fully override the list of packages that brew will install on a per-job basis.