pgsql: Clean up some perlcritic warnings

Clean up some perlcritic warnings

In Catalog.pm, mark eval of a string instead of a block as allowed.
Disallow perlcritic completely in Gen_dummy_probes.pl, as it's
generated code.
Protect a couple of lines in plperl code from  perltidy, so that the
annotation for perlcritic stays on the same line as the construct it
would otherwise object to.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/d2c1512ac48c1c25dfec07d341e9b74e57f6fbc4

Modified Files
--------------
src/backend/catalog/Catalog.pm        | 5 ++++-
src/backend/utils/Gen_dummy_probes.pl | 3 +++
src/pl/plperl/plc_perlboot.pl         | 6 +++---
src/pl/plperl/plc_trusted.pl          | 5 +++--
4 files changed, 13 insertions(+), 6 deletions(-)