Add missing counts provided by CVV endpoint

[vsedmik]

Description of changes

GET /katello/api/content_view_versions/:id returns more fields than we collected. This PR just adds those content-counts related.

Functional demonstration

$ curl -sku admin:changeme https://satellite.redhat.com/katello/api/content_view_versions/34 | jq | grep count
      "host_count": 0,
      "activation_key_count": 0
      "host_count": 0,
      "activation_key_count": 1
  "ansible_collection_count": 2,
  "docker_manifest_count": 152,
  "docker_manifest_list_count": 18,
  "docker_tag_count": 24,
  "file_count": 3,
  "rpm_count": 36,
  "modulemd_count": 7,
  "erratum_count": 6,
  "package_group_count": 2,
  "srpm_count": 0,
  "module_stream_count": 7,
  "package_count": 36,
  "component_view_count": 0,
  "ansible_collection_repository_count": 1,
  "docker_repository_count": 1,
  "file_repository_count": 1,
  "yum_repository_count": 1,
  "errata_counts": {

In [1]: from robottelo.hosts import Satellite
In [2]: sat = Satellite('satellite.redhat.com')
In [3]: sat.api.ContentViewVersion(id=34).read()
Out[4]: robottelo.hosts.DecClass(ansible_collection_count=2, ansible_collection_repository_count=1, docker_manifest_count=152, docker_manifest_list_count=18, docker_repository_count=1, docker_tag_count=24, component_view_count=0, content_view=nailgun.entities.ContentView(id=32), description=None, environment=[nailgun.entities.LifecycleEnvironment(id=31), nailgun.entities.LifecycleEnvironment(id=32)], errata_counts={'security': 3, 'bugfix': 0, 'enhancement': 3, 'total': 6}, file_count=3, file_repository_count=1, filters_applied=False, major=1, minor=0, module_stream_count=7, name='dalJwSyFhP 1.0', package_count=36, package_group_count=2, repository=[nailgun.entities.Repository(id=158), nailgun.entities.Repository(id=160), nailgun.entities.Repository(id=159), nailgun.entities.Repository(id=161)], srpm_count=0, version='1.0', yum_repository_count=1, id=34)

Additional info

I can see the same fields returned from 6.14, so adding 6.14.z flag, although I don't plan to use in 6.14.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0a9a19d) 92.15% compared to head (32e4010) 92.15%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1019   +/-   ##
=======================================
  Coverage   92.15%   92.15%           
=======================================
  Files           6        6           
  Lines        3047     3047           
=======================================
  Hits         2808     2808           
  Misses        239      239           

Files	Coverage Δ
nailgun/entities.py	91.30% <ø> (ø)

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