[feat] Print test dependencies in output of --list-detailed

[ekouts]

This is an example of the new expected output:

List of matched checks
======================
  * T0 (found in /path/to/reframe/unittests/resources/checks_unlisted/deps_complex.py)
      - description: T0
      - systems: *
      - environments: *
      - modules: 
      - task allocation: standard
      - dependencies:
      - tags: 
      - maintainers: 
  * T1 (found in /path/to/reframe/unittests/resources/checks_unlisted/deps_complex.py)
      - description: T1
      - systems: *
      - environments: *
      - modules: 
      - task allocation: standard
      - dependencies: T4, T5
      - tags: 
      - maintainers:
...

Fixes #1091

[vkarak]

I prefer the following output. We don't need such a detailed information.

List of matched checks
======================
  * T0 (found in /path/to/reframe/unittests/resources/checks_unlisted/deps_complex.py)
      - description: T0
      - systems: *
      - environments: *
      - modules: 
      - task allocation: standard
      - dependencies:  <-- just leave it empty 
      - tags: 
      - maintainers: 
  * T1 (found in /path/to/reframe/unittests/resources/checks_unlisted/deps_complex.py)
      - description: T1
      - systems: *
      - environments: *
      - modules: 
      - task allocation: standard
      - dependencies: T4, T5
      - tags: 
      - maintainers:
...

[vkarak]

We could have another option for showing the full dependency tree, but that's a different issue.

[codecov-io]

Codecov Report

Merging #1237 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1237   +/-   ##
=======================================
  Coverage   91.37%   91.37%           
=======================================
  Files          84       84           
  Lines       12398    12398           
=======================================
  Hits        11329    11329           
  Misses       1069     1069

Impacted Files	Coverage Δ
reframe/frontend/cli.py	81.45% <ø> (ø)	⬆️

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[vkarak]

lgtm