Remove old driver

[msimberg]

#1333 should happen first.

[jcanton]

this one should go together with renaming standalone_driver -> driver as then it is not necessary to make a distinction anymore

[github-actions]

Mandatory Tests

Please make sure you run these tests via comment before you merge!

• cscs-ci run default
• cscs-ci run distributed

Optional Tests

To run benchmarks you can use:

• cscs-ci run benchmark-bencher

To run tests and benchmarks with the DaCe backend you can use:

• cscs-ci run dace

To run test levels ignored by the default test suite (mostly simple datatest for static fields computations) you can use:

• cscs-ci run extra

For more detailed information please look at CI in the EXCLAIM universe.

[msimberg]

this one should go together with renaming standalone_driver -> driver as then it is not necessary to make a distinction anymore

That's in #1283.

[jcanton]

TODO: add any missing experiment to the new driver tests (e.g. APE and Gauss3D)