Add more undocumented statuses

[jadentom]

Whoops I forgot to add the actual state which was throwing exceptions in #101

[jadentom]

This MR adds new status "created" which is in the pipeline state machine https://gitlab.com/gitlab-org/gitlab-foss/blob/master/app/models/ci/pipeline.rb#L103

[codecov-io]

Codecov Report

Merging #110 into master will decrease coverage by 0.1%.
The diff coverage is 78.5%.

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
- Coverage   72.61%   72.51%   -0.11%     
==========================================
  Files         139      143       +4     
  Lines        1983     2059      +76     
==========================================
+ Hits         1440     1493      +53     
- Misses        543      566      +23

Impacted Files	Coverage Δ
...odels/Issues/Requests/ProjectIssuesQueryOptions.cs	0% <ø> (-100%)	⬇️
...lient/Models/Issues/Requests/IssuesQueryOptions.cs	100% <100%> (ø)	⬆️
.../Models/Groups/Requests/GroupLabelsQueryOptions.cs	100% <100%> (ø)
...abApiClient/Internal/Queries/IssuesQueryBuilder.cs	88.63% <100%> (+3.34%)	⬆️
...Client/Internal/Queries/GroupLabelsQueryBuilder.cs	100% <100%> (ø)
src/GitLabApiClient/GitLabClient.cs	100% <100%> (ø)	⬆️
.../Models/Groups/Requests/CreateGroupLabelRequest.cs	100% <100%> (ø)
.../Models/Groups/Requests/UpdateGroupLabelRequest.cs	60.86% <60.86%> (ø)
...LabApiClient/Models/Groups/Responses/GroupLabel.cs	62.5% <62.5%> (ø)
src/GitLabApiClient/GroupsClient.cs	51.08% <66.66%> (+3.08%)	⬆️
... and 6 more