fail if coupled config has path_gdx_ref column but not path_gdx_refpolicycost

[orichters]

Purpose of this PR

• When reading a config file and path_gdx_ref is specified but path_gdx_refpolicycost isn't, it just copies it over, which makes sense. But that means: if you specify path_gdx_ref and path_gdx_refpolicycost separately in the normal config file, but only path_gdx_ref in the coupled config file, then path_gdx_ref from the coupled config is used to overwrite path_gdx_refpolicycost, which I didn't expect and it created an error in the NGFS scenarios. The problem is that the way the code is written, the coupled config cannot know at this point whether the column exist in the other config file.
• Therefore, start_bundle_coupled.R now fails if path_gdx_ref exists in the coupled config, but not the path_gdx_refpolicycost column.
• Adapted all the existing config files
• removed GCS coupled config that @gabriel-abrahao said was not needed anymore.
• reduce default runtime in tests to 20 hours to make sure the test slurm of make test-full-slurm is not running into a timeout because the default takes too long.

Type of change

• Bug fix
• This change requires a documentation update

Checklist:

• My code follows the coding etiquette
• I performed a self-review of my own code
• I explained my changes within the PR, particularly in hard-to-understand areas
• I checked that the in-code documentation is up-to-date
• I did not adjusted the reporting in remind2 as it wasn't needed
• I did not adjust forbiddenColumnNames in readCheckScenarioConfig.R
• All automated model tests pass (FAIL 0 in the output of make test and make test-coupled)
• The changelog CHANGELOG.md has been updated correctly

[dklein-pik]

Thank you