Drop TestProcessMetricsElevatedPerms

[rockdaboot]

This test TestProcessMetricsElevatedPerms is already covered by TestProcessAllSettings.

Reasoning:

• The baseRunner is configured essentially the same as in TestProcessAllSettings
• The empty privilegedValues array is overwritten with []bool{true} (covered by TestProcessAllSettings)
• The empty runAsUserValues array is overwritten with []string{""} (covered by TestProcessAllSettings)