REST API: RunnerDetails will no longer expose version, revision, platform, architecture

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version, revision, platform, and architecture for an individual GitLab runner don't make sense now when we can have multiple runner managers assigned to the same runner with different values.

diff --git a/lib/api/entities/ci/runner_details.rb b/lib/api/entities/ci/runner_details.rb
index a26e3afb4c77..ee1ccbe9fffc 100644
--- a/lib/api/entities/ci/runner_details.rb
+++ b/lib/api/entities/ci/runner_details.rb
@@ -9,7 +9,11 @@ class RunnerDetails < Runner
         expose :locked
         expose :maximum_timeout
         expose :access_level
-        expose :version, :revision, :platform, :architecture
+        # TODO: remove in v5 https://gitlab.com/gitlab-org/gitlab/-/issues/415159
+        expose(:version) { |_runner, _options| '' }
+        expose(:revision) { |_runner, _options| '' }
+        expose(:platform) { |_runner, _options| '' }
+        expose(:architecture) { |_runner, _options| '' }
         expose :contacted_at
         expose :maintenance_note