Dev: TemplateCategory Backend Backfill

[jzbahrai]

Description

As a user I want to have a TemplateCategory Table in the backend and read the priority from them as a default.

Acceptance Criteria

• Add 3 default categories into the TemplateCategory table (LowDefault, MediumDefault, HighDefault)
• process_type on "Templates" table - drop Required constraint.
• Write and execute the following script:
  Template that have process_type -> "priority", should map to TemplateCategory HighDefault.
  process_type -> "normal", map to "MediumDefault"
  process_type -> "low", map to "LowDefault"
• Look through the API code and see where process_type is called-> instead of Template.process_type we should be calling Template.process_type if Template.process_type is NOT empty, else it is Template.TemplateCategory.process_type (SQLAlchemy relationship types - look at User.password - ADD TESTS)
• Set all the process_type in the Template table to be None (ONLY after all the above steps are complete)
• Add tests for the above

By the end of implementing the above, a Template process_type will come from the TemplateCategories table unless the process_type in the Template table is filled in.

[jzbahrai]

Hey team! Please add your planning poker estimate with Zenhub @andrewleith @whabanks

[yaelberger-commits]

@andrewleith @whabanks @jzbahrai please add your estimates for this card

[whabanks]

These AC were completed as part of this PR.
Related card

• Add 3 default categories into the TemplateCategory table (LowDefault, MediumDefault, HighDefault)
• process_type on "Templates" table - drop Required constraint.
  - Look through the API code and see where process_type is called-> instead of Template.process_type we should be calling Template.process_type if Template.process_type is NOT empty, else it is

[yaelberger-commits]

Estimates please!