Update OpenLayers version and support non-built-in projections

[geographika]

The OpenLayers template added in #7218 works fine when a request is made using one of the built-in OpenLayers projections - EPSG:4326 or EPSG:3857, however for other projections when using WMS requests and &FORMAT=application/openlayers OpenLayers throws an error:

TypeError: Cannot read properties of null (reading 'getAxisOrientation')
# at following line as projection is null
const axisOrientation = projection.getAxisOrientation();

This PR adds an additional JS check to prevent this error, by ensuring the code is registered with OpenLayers. As the map only shows layers from MapServer the actual projections don't need to have any further details (which would get very complicated and require proj4js to be included and fulll PROJ definitions to be sent back).

The check is as follows:

if (!ol.proj.get('EPSG:2157')) {
 ol.proj.addProjection(new ol.proj.Projection({ code : 'EPSG:2157' }));
}

If the projection is already supported by OpenLayers no changes are made.

The PR also includes a test, and bumps up the inbuilt OL version to a custom build based on v10.5.0 of OpenLayers, with additional ol.proj objects added (see geographika/ol-mapserver@ee41192). PR to the docs repo to follow.