test: simplify group tests

[SiasMey]

Description

• test: extract helpers
• test: remove unused params and mock setups
• test: extract setting up mock for create
• test: shuffle group post mock setup
• test: use shared helpers for setting up delete mocks
• test: creats helper for import mocks
• test: add nillable parent to group mock setup
• test: allow group delete to have empty parent (root)
• test: use new helpers in UpdateGroupsResource test
• test: use create and delete helpers all over
• test: update createImportMocks to deal with nil parent
• test: use new helpers for recreate updates
• test: add helper to set up GroupUpdate mocks
• test: gock.OffAll and root parent update helpers
• test: use import setup for update pre-plan test
• test: change ids and names for basic create
• test: update parent and id for import group
• test: re organize functions
• test: pull up test values
• test: update root values
• test: extract values for root child creation
• test: extract constants for update test
• test: fix tests for update not passing groupID
• test: extract values for recreate update test
• test: extract testName to variable
• test: use sprintf on the test manifest
• test: use interpolation for another manifest
• test: use string interpolation for another manifest
• test: use string interpolation for yet another manifest
• test: interpolate more manifests
• test: interpolate one more manifest
• test: use "real" parent_id for all requests
• test: extract group create request creation
• test: use str for parentID instead of pointer
• test: use string for delete group mock setup
• test: use string in update group mock setup
• test: rename root test groups
• test: shrink if conditional body
• test: make root parent check consistent

Related Issue(s)

• https://jira.arubanetworks.com/browse/UXI-9657

[1riatsila1]

🎉