Add support for deploy_keys to ProtectedTags REST API

Problem

In %15.10 we added a feature to allow Deploy Keys for protected tags configuration. (See issue: Extend tag protection to deploy keys (#325415 - closed))

Related chain of MRs: Add `deploy_key_id` field to `protected_tag_cre... (!109795 - merged)

Users can manage deploy keys for protected tags via UI (see documentation). But this functionality is missing for REST API.

Users cannot set deploy_key_id for protected tags via API. (related code).

Solution

Add support to add/update/remove deploy key for protected tags via REST API.