feat(iam): generate IAM policy for aws-sdk:scheduler:deleteSchedule

[VirtueMe]

Summary

• Adds IAM policy generation for arn:aws:states:::aws-sdk:scheduler:deleteSchedule resource (Support EventBridge Scheduler Service deleteSchedule integration #627)
• Refactors getEventBridgeSchedulerPermissions to accept an action parameter, shared by both createSchedule and deleteSchedule
• deleteSchedule does not require iam:PassRole (no target role needed), createSchedule still gets it
• GroupName defaults to 'default' when not specified in Parameters

Test plan

• New test: deleteSchedule with explicit GroupName generates correct scheduler:DeleteSchedule permission and no iam:PassRole
• New test: deleteSchedule without GroupName defaults schedule group to default
• Existing createSchedule test continues to pass with iam:PassRole
• Full test suite passes (448 tests)
• Lint clean

Closes #627

🤖 Generated with Claude Code

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