Fix tests for PROJ 9.7.0 and newer

[phaarnes]

Fix tests to pass for PROJ 9.7.0+ EPSG database changes

• ✅ Closes Test failures with PROJ 9.7.1 #1553

Description

This PR updates two tests (test_datum_horizontal and test_sub_crs) that fail with PROJ 9.7.0+ due to changes in the EPSG database.

Background

Starting with PROJ 9.7.0 (which includes EPSG v12.022), the EPSG database introduced national realizations of ETRS89 to better reflect how countries actually implement the European Terrestrial Reference System.

Norway uses ETRS89-NOR (also known as EUREF89), which is a specific national realization tied to epoch 1995. This is technically more correct than using the generic ETRS89 ensemble, as Norway's coordinates are tied to a specific realization.

What changed in PROJ 9.7.0

For Norwegian CRS definitions:

	PROJ < 9.7.0	PROJ >= 9.7.0
EPSG:5972	ETRS89 ensemble (EPSG:6258)	ETRS89-NOR (EPSG:1407)
EPSG:5972 horizontal sub-CRS	EPSG:25832 (ETRS89 / UTM zone 32N)	EPSG:11022 (ETRS89-NOR / UTM zone 32N)

Similar changes have been made for other Nordic countries (Denmark, Sweden, Finland) and will likely continue for other nations.

Changes

• Added PROJ_GTE_97 version check constant in test/conftest.py
• Updated test_datum_horizontal to test against the appropriate datum based on PROJ version
• Updated test_sub_crs to test against the appropriate projected CRS (EPSG:25832 or EPSG:11022) based on PROJ version

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.85%. Comparing base (b78a50d) to head (2c3b7e6).
⚠️ Report is 32 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1557      +/-   ##
==========================================
- Coverage   96.55%   95.85%   -0.71%     
==========================================
  Files          20       20              
  Lines        1827     1832       +5     
==========================================
- Hits         1764     1756       -8     
- Misses         63       76      +13     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[phaarnes]

@snowman2
Looks like all the tests passes now.

[snowman2]

Thanks @phaarnes 👍