Add targets to test command

[maroshii]

Allow to select tests when running okteto test:

okteto test unit integration ...

This is a bit trickier than in sounds given that we need to follow the depends_on field. In this case, for example, when I run okteto test unit the setup target should also get executed as a prerequisite of unit:

test:
  setup:
    image: okteto/golang:1
    commands:
      - "echo this is my test setup"
  unit:
    depends_on:
      - setup
    image: okteto/golang:1
    commands:
      - "go test . -v"
  integration:
    depends_on:
      - setup
    context: integration
    commands:
      - "./run-tests.sh"

[codecov]

Codecov Report

Attention: Patch coverage is 58.33333% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 45.67%. Comparing base (89a3aa2) to head (b1e5ce5).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4267      +/-   ##
==========================================
+ Coverage   45.64%   45.67%   +0.02%     
==========================================
  Files         308      308              
  Lines       27790    27814      +24     
==========================================
+ Hits        12685    12704      +19     
  Misses      14017    14017              
- Partials     1088     1093       +5