Fix rubocop in vscode and simplify brew install-bundler-gems calls
#21083
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This fixes an issue I was having with
rubocopin vscode.The ruby lsp setup in vscode is now much simpler, since it uses the same ruby setup commands we use for other shell commands, so hopefully future changes will be less destructive.
As part of this, I added a new ruby helper function to run
brew install-bundler-gemsif needed, which is used a few times by shell commands and the ruby lsp setup