OGCAPI intial tests

[elpaso]

Fix #7679

Initial implementation of tests for OGCAPI

[rouault]

There's a specific error with the build-windows-conda (https://github.com/OSGeo/gdal/actions/runs/5321551897/jobs/9636788770?pr=7926)

36: FAILED gdrivers/ogcapi.py::test_ogr_ogcapi_features - RuntimeError: Unsupported HTTP version (2.0) in response
36: FAILED gdrivers/ogcapi.py::test_ogr_ogcapi_vector_tiles[AUTO] - RuntimeError: Unsupported HTTP version (2.0) in response
36: FAILED gdrivers/ogcapi.py::test_ogr_ogcapi_vector_tiles[GEOJSON] - RuntimeError: Unsupported HTTP version (2.0) in response
36: FAILED gdrivers/ogcapi.py::test_ogr_ogcapi_vector_tiles[GEOJSON_PREFERRED] - RuntimeError: Unsupported HTTP version (2.0) in response
36: FAILED gdrivers/ogcapi.py::test_ogr_ogcapi_vector_tiles[MVT] - RuntimeError: Unsupported HTTP version (2.0) in response
36: FAILED gdrivers/ogcapi.py::test_ogr_ogcapi_vector_tiles[MVT_PREFERRED] - RuntimeError: Unsupported HTTP version (2.0) in response
36: FAILED gdrivers/ogcapi.py::test_ogr_ogcapi_raster[MAP-Collection ne_10m_lakes_europe] - RuntimeError: Unsupported HTTP version (2.0) in response
36: FAILED gdrivers/ogcapi.py::test_ogr_ogcapi_raster[TILES-Collection ne_10m_lakes_europe] - RuntimeError: Unsupported HTTP version (2.0) in response
36: FAILED gdrivers/ogcapi.py::test_ogr_ogcapi_raster[COVERAGE-SRTM] - RuntimeError: Unsupported HTTP version (2.0) in response

We should probably use HTTP 1.1 to be safe

[rouault]

@elpaso I finally figured the reason of the failures of the vector side. The reason is that CMake had to be run twice to have OGR_ENABLE_DRIVER_GML defined. Fixed per #7993