Update gitlab-glaz to 2.1.0

What does this MR do and why?

• Updates the gitlab-glaz gem from 2.0.0 to 2.1.0 in Gemfile, Gemfile.lock, and Gemfile.next.lock. No other gems change, and the pinned glaz-module revision is unchanged.
• Version 2.1.0 adds a :key field to every entry of Gitlab::Glaz.roles. It is the role's stable machine identifier (for example "artifact_admin", "organization_admin"), next to :id, :name, and :permissions. The change is additive only.
• Switches both Authz role catalogues to resolve roles by that key instead of matching on the display name:
  • Authz::ArtifactRegistry::Roles drops the hand-maintained NAMES table and builds its id lookups from role[:key]. It keeps a KEYS allowlist of the four Artifact Registry roles, so platform roles such as organization_admin still resolve to nil. uuid_for and name_for keep their signatures and return values.
  • Authz::Organizations::Roles replaces ORGANIZATION_ADMIN_NAME with ORGANIZATION_ADMIN_KEY = 'organization_admin' and finds the role by key. organization_admin_uuid is unchanged for callers.
• Both specs now stub roles with a key, and a new test checks that the Artifact Registry catalogue returns nil for the platform role.
• No user-facing behavior change. Specs for both catalogues and their callers pass locally.

References

• Upstream release MR: gitlab-org/ruby/gems/gitlab-glaz!67 (merged)

MR acceptance checklist

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