vim-patch:9.2.0568: pythoncomplete: g:pythoncomplete_allow_import had no effect (#40067)

Problem:  The security patch 9.2.0561 added a vim.eval() call inside
          Completer.evalsource() to honor g:pythoncomplete_allow_import.
          But the 'vim' module is only imported inside the outer
          vimcomplete() / vimpy3complete() function, not at the script's
          top level, so referring to it from a Completer method raises
          NameError.  The surrounding bare 'except' silently swallows
          the error and leaves allow_imports at 0, meaning the opt-in
          never takes effect -- 'import os' (and any other
          buffer-level import) is always skipped, no candidates are
          produced for 'os.<...>' and
          Test_popup_and_preview_autocommand() fails on the Windows
          CI matrix (Linux skips the test because Python 2 is absent).
Solution: Re-import 'vim' at the top of evalsource() in both
          pythoncomplete.vim and python3complete.vim so the eval reads
          the global, and set g:pythoncomplete_allow_import = 1 in the
          test (it is the opt-in intended for callers that trust the
          buffer contents) (thinca).

closes: vim/vim#20386

https://github.com/vim/vim/commit/868ad62cb8bf8038322eab2badd31bd98b02b9df

Co-authored-by: thinca <thinca@gmail.com>

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