🚀 Update Agent Pool requeue duration logic

[arybolovlev]

Description

The AgentPool controller re-queues instances every 30 seconds by default even if those that are in the Cool Down period stage and no actions will be taken. This PR changes this logic and instances will be re-queued after the Cool Down period if applicable, otherwise, the default timer is applied.

Tests

• https://github.com/hashicorp/terraform-cloud-operator/actions/runs/9462052652
• https://github.com/hashicorp/terraform-cloud-operator/actions/runs/9462053898
• https://github.com/hashicorp/terraform-cloud-operator/actions/runs/9462055264
• https://github.com/hashicorp/terraform-cloud-operator/actions/runs/9462056435

Usage Example

N/A.

References

• Depends on: https://github.com/hashicorp/terraform-cloud-operator/pull/421

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