chore: increase soak duration (#1399)

## Description

Run soak tests over a longer period of time, as requested by team.

End to End Test:  <!-- if applicable -->  
(See [Pepr Excellent
Examples](https://github.com/defenseunicorns/pepr-excellent-examples))

## Related Issue

N/A

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [x] Other (security config, docs update, etc)

## Checklist before merging
- [x] Unit,
[Journey](https://github.com/defenseunicorns/pepr/tree/main/journey),
[E2E Tests](https://github.com/defenseunicorns/pepr-excellent-examples),
[docs](https://github.com/defenseunicorns/pepr/tree/main/docs),
[adr](https://github.com/defenseunicorns/pepr/tree/main/adr) added or
updated as needed
- [x] [Contributor Guide
Steps](https://docs.pepr.dev/main/contribute/#submitting-a-pull-request)
followed

.github/workflows/soak.yaml

@@ -170,7 +170,7 @@ jobs:
           }
 
           # Start collecting metrics every 5 minutes and checking pod counts every 30 minutes
-          for i in {1..27}; do  # 27 iterations cover 135 minutes (2 hours and 15 minutes)
+          for i in {1..70}; do  # 70 iterations cover 350 minutes (5 hours and 50 minutes)
             collect_metrics
             cat logs/informer-log.txt
             cat logs/auditor-log.txt