Default clojure-lsp startup behaviour is changed since v2.0.327

[PEZ]

The default clojure-lsp startup mistakingly changed with our added support for running multiple clojure-lsp servers. We need to restore this to it's old default and optionally provide configuration for the current start-up behaviour for workspaces that would benefit from it. (Though, most often workspaces benefit better from configuring them to be served by just one clojure-lsp server.)

The change can have quite serious implications. In a workspace I have, there are lots of clojure-lsp servers spawning when I open it in VS Code. Even with the smarter startup introduced with #2075 and #2076 we still spawn about 30 servers in this workspace. Looks like so: