Prepare neuvector chart for 2.7.0

[MKlimuszka]

neuvector chart needs to be updated for 2.7 by

1. File a PR removing the doNotRelease flag form the package.yaml; in this PR, you will also want to make any changes that need to be made to update the chart to the version you intend to release in 2.7. For example, for a charts like rancher-aks-operator / rancher-gke-operator / rancher-eks-operator, you will need to create a new branch in upstream for Rancher 2.7, cut the first release for that chart, and introduce those changes in to the package.yaml as well before removing the doNotRelease flag
2. To make your chart available for 2.7, almost every chart will also have to modify the Rancher Version annotations that scope it to 2.6, i.e. https://github.com/rancher/charts/blob/2e058e93ee01f2980e4750148842dd7f04262b38/charts/fleet-agent/100.0.5%2Bup0.3.11/Chart.yaml#L8
3. Once the PR is merged, ensure that the brand new chart is smoke tested by QA/dev