[vim/vim] Fix hardcopy tests for GTK4 GUI (PR #21009)

The main problem is that `hardcopy` is used instead of `hardcopy!`, so GTK4 print dialog attempts to show, which tries to use xdg-desktop-portal that is not available.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21009

-- Commit Summary --

  * set GDK_DEBUG=no-portals for hardcopy tests
  * use bang with :hardcopy to prevent GTK4 dialog

-- File Changes --

    M .github/workflows/ci-linux.yml (1)
    M .github/workflows/ci-linux_asan.yml (1)
    M src/testdir/test_hardcopy.vim (6)

-- Patch Links --

https://github.com/vim/vim/pull/21009.patch
https://github.com/vim/vim/pull/21009.diff

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