FWI-2719: Enable and add exemptions for recently-added checks

[ivanfetch-wt]

Checklist

• [x] I have signed the CLA
• [x] I have updated/added any relevant documentation

Description

What's the goal of this PR?

These checks are now enabled in the default Polaris configuration:

• automountServiceAccountToken
• linuxHardening
• missingNetworkPolicy
• sensitiveConfigmapContent and sensitiveContainerEnvVar
• clusterrolebindingClusterAdmin, rolebindingClusterAdminClusterRole, and rolebindingClusterAdminRole
• clusterrolePodExecAttach, rolePodExecAttach, clusterrolebindingPodExecAttach, rolebindingClusterRolePodExecAttach, and rolebindingRolePodExecAttach

Fixed the sensitiveContainerEnvVar check to ignore sensitive environment variable names when those variables use valueFrom to reference an external resource.

Added the *ClusterAdmin checks to examples/config-full.yaml.

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[ivanfetch-wt]

I'm waiting to merge this (making these checks live for the Polaris community) until a deeper round of initial testing has completed.

[rbren]

Thanks for adding all the new test cases!