feat: Replace 'send:region:..' scopes (planning#2415)

CHANGELOG.md

Makefile

spec/endpoints/attachments/uuid.yaml

spec/endpoints/cases/events/index.yaml

spec/endpoints/cases/index.yaml

spec/endpoints/cases/uuid.yaml

spec/endpoints/destinations/uuid.yaml

spec/endpoints/replies/accept/uuid.yaml

spec/endpoints/replies/attachments/uuid.yaml

spec/endpoints/replies/events/index.yaml

spec/endpoints/replies/index.yaml

spec/endpoints/replies/reject/uuid.yaml

spec/endpoints/replies/uuid.yaml

spec/endpoints/submissions/events/index.yaml

spec/endpoints/submissions/index.yaml

spec/endpoints/submissions/uuid.yaml

spec/security/oauth2.yaml