pgstat: add pg_stat_have_stats() test helper.

Andres Freund <andres@anarazel.de>

Commit: ad401664b8012cafb64e8fce33fe40356c5bc686
Author: Andres Freund <andres@anarazel.de>
Date: 2022-04-07T07:21:54Z
Releases: 15.0
pgstat: add pg_stat_have_stats() test helper.

Will be used by tests committed subsequently.

Bumps catversion (this time for real, the one in 0f96965c658 got lost when
rebasing over 5c279a6d350).

Author: Melanie Plageman <melanieplageman@gmail.com>
Discussion: https://postgr.es/m/CAAKRu_aNxL1WegCa45r=VAViCLnpOU7uNC7bTtGw+=QAPyYivw@mail.gmail.com

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