Fixes #230 as cfn-lint now passes with no errors

[flagscript]

What does this PR do?

This pull request allows template.yaml to successfully pass a cfn-lint check with no errors or warnings.

Motivation

It's typical in CodeBuild steps to perform cfn-lint on all CloudFormation templates before deployment. Currently, template.yaml is failing a cfn-lint check with an error and a warning:

> cfn-lint --template aws/logs_monitoring/template.yaml

W2510 Lambda Memory Size parameters should use MinValue, MaxValue or AllowedValues at Parameters/MemorySize
aws/logs_monitoring/template.yaml:22:3

E3012 Property Resources/Forwarder/Properties/Environment/Variables/DD_ENHANCED_METRICS should be of type String
aws/logs_monitoring/template.yaml:269:11

Additional Notes

Not relevant to this pull, but might be worth while in the future to replace aws cloudformation validate-template in release.sh with cfn-lint, as the former only validates that templates follow syntax, while the later will test for actual inconsistencies as well.

Checklist

• Member of the datadog team has run integration tests