Refactor Twistlock ServiceAccount hardening to use wildcard

General MR

Summary

Omits the serviceAccounts list in Twistlock automountServiceAccountToken hardening, allowing the mutator to target all SAs via wildcard. This is more robust and better accommodates upstream changes over time.

At the moment, however, this is a simple refactor and there is no change to the original hardening.

Relevant logs/screenshots

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Linked Issue

Closes https://repo1.dso.mil/big-bang/bigbang/-/issues/1866

Upgrade Notices

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