Reindex wikis to adopt new structure of id

Reindex wikis to adopt the new id structure. The group wikis and project
wikis id will be prefixed by g_ and p_ respectively. After the
reindexing, all the wiki docs will have schema_version 2402.

Changelog: fixed
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/143273
EE: true