pgsql: pgstat: Hide instability in stats.spec with -DCATCACHE_FORCE_REL

pgstat: Hide instability in stats.spec with -DCATCACHE_FORCE_RELEASE.

With -DCATCACHE_FORCE_RELEASE a few tests failed. Those were trying to test
behavior in the absence of invalidation processing and
-DCATCACHE_FORCE_RELEASE obviously adds a lot of invalidation processing. The
test already tried to handle debug_discard_caches > 0, by disabling it for
individual tests.

Instead hide potentially problematic function calls in a wrapper function that
catches the does-not-exist error. The error isn't the actually interesting
bit, it's whether the stats entry still exist afterwards.

I confirmed that the tests still catches leaked function stats if I nuke the
protections against that in pgstat_function.c.

Per buildfarm animal prion.

Discussion: https://postgr.es/m/20220407165709.jgdkrzqlkcwue6ko@alap3.anarazel.de

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/d6c0db14836cd843d589372d909c73aab68c7a24

Modified Files
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src/test/isolation/expected/stats.out | 152 ++++++++++++++++----------------
src/test/isolation/expected/stats_1.out | 152 ++++++++++++++++----------------
src/test/isolation/specs/stats.spec | 38 ++++----
3 files changed, 172 insertions(+), 170 deletions(-)