Merge dblink's paths test script into its main test.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 0e6e7f0806b2080cb31f33ff992ec2e4e35fa6f1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-12-20T21:49:13Z
Releases: 15.0
Merge dblink's paths test script into its main test.

There's no longer any reason to fire up a separate psql run
to create these functions.  (Some refactoring in the main
regression tests is also called for, but that will take
more thought.)

Discussion: https://postgr.es/m/1655733.1639871614@sss.pgh.pa.us

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