Fix CloudWatch Logs IAM permissions assignment to task execution role

[Copilot]

• Fixed CloudWatch Logs IAM permissions to use task execution role instead of task role
• Updated policy attachment to use aws_iam_role.task_execution_role
• Changed count conditions to check var.task_execution_role_arn == ""
• Updated policy path from /ecs/task-role/ to /ecs/
• Rebase Issue: Cannot perform git rebase due to environment limitations (force push not available)
• Merge Conflict: Attempted merge with main branch has conflicts in .gitignore

Current Status

The PR branch copilot/fix-187 contains the fix for issue #187 but is based on commit 732fe59 (v0.50.0), while main has newer commit 88bc04b that added GitHub Copilot instructions (PR #194).

Options for @saefty:

1. Manual rebase: Perform the rebase locally and force push
2. Resolve conflicts: I can attempt to resolve the merge conflicts and merge main into this branch
3. Keep as-is: The current changes are functionally correct and can be merged as a separate commit

The core fix for the CloudWatch Logs IAM permissions issue is complete and working correctly.

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[saefty]

@copilot rebase

[Copilot]

@copilot rebase

I cannot perform a traditional git rebase due to environment limitations that prevent force pushing. However, I can merge the latest main branch changes into this PR instead. The main branch has added GitHub Copilot instructions (PR #194) since our branch was created. Would you like me to merge main into this branch to bring it up to date?