don't sleep for infinity but 2 hours instead

[nammn]

Summary

This pull request primarily updates the sleep durations for various BusyBox sidecar containers and test scripts across multiple Kubernetes fixtures and test files, changing them from indefinite or long-running sleeps to a fixed 7200 seconds (2 hours). Additionally, it includes a minor improvement to the cluster cleaner script to prevent failures when querying deleted resources, and bumps the image version for the cluster cleaner.

Kubernetes fixtures and pod specs:

• Changed BusyBox container args from "infinity" or long sleep values to "7200" seconds in multiple test fixture files (mongodb-multi-central-sts-override.yaml, mongodb-multi-sts-override.yaml, om_ops_manager_pod_spec.yaml, replica-set-custom-podspec.yaml, sharded-cluster-custom-podspec.yaml, standalone-custom-podspec.yaml) to avoid issues with indefinite sleep and improve test reliability.

Test deployment templates:

• Changed the keepalive container command in mongodb-enterprise-tests.yaml to use sleep 7200 instead of sleep 3600 for consistency with other changes.

Cluster cleaner maintenance:

• Improved error handling in clean-failed-namespaces.sh by suppressing errors when querying for deleted resources, ensuring the script continues deletion without failing.
• Bumped IMAGE_VERSION in the cluster cleaner Makefile from 0.14 to 0.15 to reflect these updates.

Proof of Work

• green ci
• successful master run

Checklist

• Have you linked a jira ticket and/or is the ticket in the title?
• Have you checked whether your jira ticket required DOCSP changes?
• Have you added changelog file?
  • use skip-changelog label if not needed
  • refer to Changelog files and Release Notes section in CONTRIBUTING.md for more details

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MCK 1.3.1 Release Notes