feat: expose retention_rule in cos base module

[kierramarie]

Description

Exposed retention_rule in base module and added retention_rule to the patterns' override.json.

Git Issue: #978

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[kierramarie]

/run pipeline

[kierramarie]

/run pipeline

[kierramarie]

/run pipeline

[kierramarie]

Latest errors:

2025-06-16T19:16:29.3976853Z TestRunUpgradeROKSQuickStartPattern 2025-06-16T19:16:29Z command.go:206: �[31m│ summary: 'timeout while waiting for state to become ''deleted'' (last
2025-06-16T19:16:29.3978373Z TestRunUpgradeROKSQuickStartPattern 2025-06-16T19:16:29Z command.go:206: �[31m│ state: ''deleting'',

[kierramarie]

/run pipeline

[kierramarie]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 8.3.0 🎉

The release is available on:

• GitHub release
• v8.3.0

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