Adjusted project-configs to new magpie config structure

[FelicitasBeier]

Purpose of this PR

MAgPIE has adjusted its scenario_config structure. Project-specific config files have been separated from the main scenario_config.csv (see magpiemodel/magpie#700).
This required an update of the config_coupled project scripts.

Furthermore, two project-specific config file (scenario_config_EL2p0DeepDive.csv and scenario_config_EL2p0DeepDive_coupled.csv) for the EAT2p0 project have been added.

Type of change

(Make sure to delete from the Type-of-change list the items not relevant to your PR)

• Bug fix

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 adjusted the reporting in remind2 where it was needed
• I adjusted forbiddenColumnNames in readCheckScenarioConfig.R in case the PR leads to deprecated switches
• All automated model tests pass (FAIL 0 in the output of make test)
• The changelog CHANGELOG.md has been updated correctly

Further information (optional):

• Test runs are here: /p/projects/magpie/users/beier/Test_Coupling/remind
• Comparison of results (what changes by this PR?):

[dklein-pik]

Thank you!