VIP MU plugins v20260310.0

View Pull Request: https://github.com/Automattic/vip-go-mu-plugins/pull/6841

Changed

• Updated Akismet to 5.6.
• Moved the tooling for purging page cache from a widget to its own screen in the VIP navigation menu group and improved guardrails against accidental purges.

Added

• WordPress Dashboard widget to clear edge cache (origin responses, VIP File Service uploads, static assets)

Fixed

• Hardening: improve security of wpcom_vip_get_user_profile()
• Update TRUE_CLIENT_IP check to also encompass HTTP_CF_CONNECTING_IP