In https://github.com/neovim/neovim/pull/34092 we changed the
healthcheck to display root markers as a concatenated list if the first
item in root_markers is a string (not a table). However, this does not
solve the general case, because root_markers can contain a string as the
first element, but a table as the 2nd element.
Because root_markers has a more complex structure we should always just
display it using vim.inspect, rather than adding a special case for when
all items are a string.
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