WOR-1156 fix swagger docs

[blakery]

WOR-1156(https://broadworkbench.atlassian.net/browse/WOR-1156

• remove unused v1 billing component
• add missing field to v2 component

Have you read CONTRIBUTING.md lately? If not, do that first.

I, the developer opening this PR, do solemnly pinky swear that:

• I've followed the instructions if I've made any changes to the API, especially if they're breaking changes
• I've updated the RC_XXX release ticket with any manual steps required to release this change
• I've updated the FISMA documentation if I've made any security-related changes, including auth, encryption, or auditing

In all cases:

• Get two thumbsworth of review and PO signoff if necessary
• Verify all tests go green
• Squash and merge; you can delete your branch after this unless it's for a hotfix. In that case, don't delete it!
• Test this change deployed correctly and works on dev environment after deployment

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (488314b) 69.54% compared to head (dcc9faf) 69.54%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1185   +/-   ##
========================================
  Coverage    69.54%   69.54%           
========================================
  Files          101      101           
  Lines         3471     3471           
  Branches       362      362           
========================================
  Hits          2414     2414           
  Misses        1057     1057           

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