v2.8.8 - Rancher Manager Release Maintenance Task Checklist

[martyav]

This issue is to track tasks that need to be done every release regardless of whether the release has new feature content or not.

• Update the versions table: 2.8.8 versions table #1470
• Update the Rancher:webhook version mapping table: 2.8.8 webhook table entry #1471
• Update the CNI popularity table: 2.8.8/2.9.2 update cni stats #1478
• Update the CSP adapter compatibility matrix: 2.8.8 csp adapter entry #1473
• Update the deprecated features table: 2.8.8 deprecated features entry #1472
• Create a new release
• Update Algolia search index