Remove support for v1 legacy tools

[nwmac]

• [2.7.0] Remove v1 cis-benchmark chart components from UI #6876
• [2.7.0] Remove istio v1 chart components from UI #6874
• [2.7.0] Remove Rancher v1 Pipelines UI components #6872

[deniseschannon]

Please also remove/hide the logging v1 tools as well from the UI

Here is the backend issue, but the backend won't be removed until v2.7.1: rancher/rancher#37318

[nwmac]

What will be removed:

In the 'legacy' section of the side-nav when exploring a cluster:

• CIS Scans

• Project / Istio

• Project / Logging

• Project / Pipelines

Additionally, the Istio and Logging v1 tools shown in the 'Cluster Tools' section will only now appear IF they are already installed - they will no longer be installable from the new UI - the can still be managed if already installed, so that the user can remove them in order to upgrade to v2.

[ronhorton]

Pass verified in 2.7-head commit id 4092002
apps removed from UI