ISSUE-1481: spread vhost-config secret to avoid risking overcome 1Mb

Check list to complete before assigning a MR to someone:

• Link related issues on Related Issues;
• Link on Related MR all MRs in satellite projects that this MR deploys;
• Update documentation;
• Comment relevant changes, why/what lead us to make this change;
• Manual actions on clusters (before and after) if needed => add tag manual-action to MR;
• Create Vault backup if secrets were changed => ping okd-staff-members
• Review at least once you own MR;
• Integration tests green;

Related issues:

https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/1481

Related MRs:

https://gitlab.cern.ch/paas-tools/okd4-install/-/merge_requests/1778

!22 (merged)

paas-tools/okd4-deployment/gitlab-pages-authenticating-proxy!19 (merged)

paas-tools/okd4-deployment/gitlab-pages-authenticating-proxy!21 (merged)