fix(config): improve logging setup and tests selection in the framework

[Diogo21Costa]

PR summary

This PR introduces two major changes:

1. Enable the definition of an array of strings for both the list of suites and tests (commit 01df220).
2. Remove the "echo" and "log_level" configurations from config.dts; configuration is now performed via the command line (commits bfd1cfa and 47b26b7).

Old config.dts format:

/dts-v1/;
/ {
    platform = "qemu-aarch64-virt";
    echo = "full";  // fulll, tf, none

    test_config {
        recipe_test {
            nix_file = "default.nix";
            suites = "SUITE_1 SUITE_2";
            tests = "";
            log_level = "1"; //0, 1, 2
        };
    };
};

New config.dts format:

/dts-v1/;
/ {
    platform = "qemu-aarch64-virt";

    test_config {
        recipe_test {
            nix_file = "default.nix";
            suites = "SUITE_1", "SUITE_2";
            tests = "";
        };
    };
};

Old python framework execution command:

python3 test_framework.py\
  -dts_path $ROOT_DIR/tests/configs/mix_suite.dts\
  -bao_test_src_path $ROOT_DIR/bao-tests/src\
  -tests_src_path $ROOT_DIR/tests/src\

New python framework execution command:

python3 test_framework.py\
  -dts_path $ROOT_DIR/tests/configs/mix_suite.dts\
  -bao_test_src_path $ROOT_DIR/bao-tests/src\
  -tests_src_path $ROOT_DIR/tests/src\
  -echo=full\
  -log_level=1