pgsql: Use daterange and YMD in without_overlaps tests instead of tsran

Use daterange and YMD in without_overlaps tests instead of tsrange.

This makes things a lot easier to read, especially when we get to the
FOREIGN KEY tests later.

Author: Paul A. Jungwirth <pj@illuminatedcomputing.com>
Discussion:
https://www.postgresql.org/message-id/flat/CA+renyUApHgSZF9-nd-a0+OPGharLQLO=mDHcY4_qQ0+noCUVg@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/a88c800deb6ff3fe5e5dccd56f771d2132f74a9b

Modified Files
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src/test/regress/expected/without_overlaps.out | 76 +++++++++++++-------------
src/test/regress/sql/without_overlaps.sql      | 42 +++++++-------
2 files changed, 62 insertions(+), 56 deletions(-)