Post review fixes for test_json_parser test module

Andrew Dunstan <andrew@dunslane.net>

Commit: ba3e6e2bca97df14920375b0a1ebf4eab95b78b5
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2024-04-23T19:32:06Z
Releases: 17.0
Post review fixes for test_json_parser test module

. Add missing copytight notices
. improve code coverage
. put work files in a temp directory in the standard location
. improve error checking in C code
. indent perl files with perltidy
. add some comments

per comments from Michael Paquier

Discussion: https://postgr.es/m/ZiC3-cdFys4-6xSk@paquier.xyz

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