[enhancement] Use name_prefix for cloudwatch log group to avoid namespace collisions

[sblack4]

terraform-aws-notify-slack/main.tf

Line 52 in 82f536b

name = "/aws/lambda/${var.lambda_function_name}"

We already have another similarly named group and so I get this error.

Error: Creating CloudWatch Log Group failed: ResourceAlreadyExistsException: The specified log group already exists:  The CloudWatch Log Group '/aws/lambda/notify_slack' already exists.

This can be avoided by using a name_prefix, https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_log_group#name_prefix

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[bryantbiggs]

duplicate #104

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