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Prevent postgres_exporter errors during GIN index creation

Matt Smiley requested to merge update_function_postgres_gin_pending_list_size into master

The function being updated in this MR is used only by the postgres_exporter, which generates prometheus metrics from SQL query results.

When a GIN index is being created or dropped, we cannot inspect its metapage 0 to count pending-list entries. To avoid that error, we skip inspecting such indexes until they reach a state where they have a metapage to inspect.

Issue: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/16723

Test results in staging: !163 (comment 1153671133)

Edited by Matt Smiley

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