This reverts commit f2755533de.
This adds fix for julia layer breaking yasnippet setup.
Commit f2755533de fixed a specific bug in julia
layer but it loads yasnippet and friends on start up which adds 1 sec to my
startup time even though I don't use julia.
Julia layer loads lsp-julia early on startup, which loads lsp who then loads
yasnippet behind the scene unknown to spacemacs and use-package. That's why our
nice and ordered setup for yasnippet and yasnippet-snippets failed as discussed
in https://github.com/syl20bnr/spacemacs/pull/15171. We now tell use-package to
defer its load.
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