fix(lsp): apply_text_edits causes unwanted BufDelete events #38778

Problem:
Since 2f6d1d3c88, `apply_text_edits`
unconditionally sets `buflisted=true`, causing spurious BufDelete events
if plugins restore the original 'buflisted' state on unlisted buffers:
65ef6cec1c/src/nvim/option.c (L2159-L2169)

Solution:
- Don't set 'buflisted' in `apply_text_edits`. Set it more narrowly, in
  `apply_workspace_edit` where the semantics requires affected buffers
  to be visible to the user.
- Also skip setting 'buflisted' if it would not be changed, to avoid
  redundant `OptionSet` events.

(cherry picked from commit 6473d007e7)

test/functional/plugin/lsp_spec.lua

@@ -2639,6 +2639,7 @@ describe('LSP', function()
           return vim.api.nvim_buf_get_lines(target_bufnr, 0, -1, false)
         end, make_workspace_edit(edits))
       )
+      eq(true, api.nvim_get_option_value('buflisted', { buf = target_bufnr }))
     end)
 
     it('apply_workspace_edit applies multiple edits', function()