Loadtest internal alb logging and osquery-perf scaling updates

[BCTBB]

• Configures internal alb to log to the same bucket as the public alb
• Adds support for osquery-perf task size (cpu/memory) configuration
• Updates defaults for osquery-perf extra_flags
• Updates default enroll.sh loop sleep_time from 60s -> 300s

[claude]

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