[vim/vim] tests: Test_xrestore() is flaky and cannot recover (PR #21066)

```
Problem:  Test_xrestore() fails on CI and the retry fails as well, because
          the retry runs in the same Vim and the connection to the X server
          was not restored.
Solution: Restore the display in a "finally" block.  Wait for the selection
          to become available instead of failing with E353.
```

The failure: https://github.com/vim/vim/actions/runs/31956315725/job/95187385784
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21066

-- Commit Summary --

  * tests: Test_xrestore() is flaky and cannot recover

-- File Changes --

    M src/testdir/test_paste.vim (26)

-- Patch Links --

https://github.com/vim/vim/pull/21066.patch
https://github.com/vim/vim/pull/21066.diff

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