[WOR-1243] Update for rawls-model change.

[cahrens]

Related Rawls PR: broadinstitute/rawls#2522

Without updating rawls model, fetching workpace tags through orchestration fails (terra-ui does this).

Ticket: https://broadworkbench.atlassian.net/browse/WOR-1243

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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 has no changes to coverable lines.

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