Fix for Synapse SQL Pool

[SergioMiyama]

Fix for Synapse SQL Pool

---

• [X] I have read the CONTRIBUTING.MD instructions
• [X] I have changed the resourceDefinition.json
• [X] I have generated the resource model (there's a models_generated.go file in my PR)
• [X] I have updated the README.md#resource-status
• [X] I have checked to ensure there aren't other open Pull Requests for the same update/change?

Description

Synapse SQL Pool should be 15 chars long and contain only letters, numbers or underscore.

Does this introduce a breaking change

• [X] YES
• [ ] NO

Testing

│ Error: name can contain only letters, numbers or underscore, The value must be between 1 and 15 characters long │ │ with module.example.module.synapse_sql_pool["sysp1"].azurerm_synapse_sql_pool.sysp, │ on ../modules/synapse/synapse_sql_pool/module.tf line 11, in resource "azurerm_synapse_sql_pool" "sysp": │ 11: name = azurecaf_name.sysp.result

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