Merge branch 'feature/ci_test_config_autogen' into 'master'

Merge branch 'feature/ci_test_config_autogen' into 'master'

CI: auto generate configs for test jobs

Currently CI test jobs are static configured by several pre-generated config files.
This approach have several disadvantages:

1. not flexible to select test cases to run, which is important feature of @bot
2. difficult to update test as we need to pre-generate quite a lot files
3. need to maintain extra config files in IDF
4. not flexible to support new test apps or chips, can't use some new features of test bench

Therefore we'll add assign_test stage between build and test, to generate configs for test jobs.

See merge request !738