Revert temporal primary keys and foreign keys

This feature set did not handle empty ranges correctly, and it's now
too late for PostgreSQL 17 to fix it.

The following commits are reverted:

    6db4598 Add stratnum GiST support function
    46a0cd4 Add temporal PRIMARY KEY and UNIQUE constraints
    86232a4 Fix comment on gist_stratnum_btree
    030e10f Rename pg_constraint.conwithoutoverlaps to conperiod
    a88c800 Use daterange and YMD in without_overlaps tests instead of tsrange.
    5577a71 Use half-open interval notation in without_overlaps tests
    34768ee Add temporal FOREIGN KEY contraints
    482e108 Add test for REPLICA IDENTITY with a temporal key
    c3db1f3 doc:  clarify PERIOD and WITHOUT OVERLAPS in CREATE TABLE
    144c2ce Fix ON CONFLICT DO NOTHING/UPDATE for temporal indexes

Discussion: https://www.postgresql.org/message-id/d0b64a7a-dfe4-4b84-a906-c7dedfa40a3e@eisentraut.org

Author: petere

contrib/btree_gist/Makefile

@@ -33,14 +33,12 @@ EXTENSION = btree_gist
 DATA = btree_gist--1.0--1.1.sql \
        btree_gist--1.1--1.2.sql btree_gist--1.2.sql btree_gist--1.2--1.3.sql \
        btree_gist--1.3--1.4.sql btree_gist--1.4--1.5.sql \
-       btree_gist--1.5--1.6.sql btree_gist--1.6--1.7.sql \
-       btree_gist--1.7--1.8.sql
+       btree_gist--1.5--1.6.sql btree_gist--1.6--1.7.sql
 PGFILEDESC = "btree_gist - B-tree equivalent GiST operator classes"
 
 REGRESS = init int2 int4 int8 float4 float8 cash oid timestamp timestamptz \
         time timetz date interval macaddr macaddr8 inet cidr text varchar char \
-        bytea bit varbit numeric uuid not_equal enum bool partitions \
-        stratnum without_overlaps
+        bytea bit varbit numeric uuid not_equal enum bool partitions
 
 SHLIB_LINK += $(filter -lm, $(LIBS))