Handle `Timeout talking to backend` gracefully

[dentarg]

Issue to track all places the provider needs to handle Timeout talking to backend gracefully – not crash, and instead keep polling (number of retries and time to sleep between retries should be configurable).

• [x] cloudamqp_plugin
  • reported at https://github.com/cloudamqp/terraform-provider-cloudamqp/issues/232#issuecomment-1806185675
  • addressed by https://github.com/cloudamqp/terraform-provider-cloudamqp/pull/241
• [x] cloudamqp_privatelink_azure (Read)
  • reported at https://github.com/cloudamqp/terraform-provider-cloudamqp/issues/232
  • addressed by https://github.com/cloudamqp/terraform-provider-cloudamqp/pull/246
• [x] cloudamqp_vpc_gcp_peering (Create)
  • reported at https://github.com/cloudamqp/terraform-provider-cloudamqp/issues/242#issuecomment-1836396531
  • addressed by https://github.com/cloudamqp/terraform-provider-cloudamqp/pull/247

[tbroden84]

Updated the task list with corresponding pull requests.

[tbroden84]

Thanks for the list! Available in v1.29.0