test only relevant tests in quicktest pipeline

[matteodelucchi]

Problem:

• Independent of the change, all tests are run in the quickest pipeline
• The CRANchecks like pipeline has the tests turned off, because they have been run before.

Solution:

• in the quickest pipeline, run only the corresponding test to the file that has been changed and only if a file in the directory /R has changed.
• For changes in source code functions, for the moment, run all tests as it is hard to pick all R functions that call the respective C function.
• Turn complete testing on in the CRAN like test pipeline.

[j-i-l]

If changes in src/ test all, otherwise test only changed files