PoC: Group-Level Protected Environments

What does this MR do?

related #215888 (closed)

protected_environments ( -- environment_protection_rules
  id integer NOT NULL,
  project_id integer,
  group_id integer,
  name character varying
  tier smallint

environemnts (
  name,
  tier,
  url,
  protected_by_id: (FK to protected_environments)
)

protected_environments_envionments (
  environment_id: (FK),
  protected_environment_id: (FK),
)

ci_build_environment_metadata (
  build_id: (FK to ci_builds)
  environment_id: (FK to environments)
  action: start/stop/prepare
)

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

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