Remove call to Read handler at the end of Create & Update, to reduce latency in stack operations

[miparnisari]

Issue #, if available: https://github.com/aws-cloudformation/aws-cloudformation-resource-providers-logs/issues/39

Description of changes: Remove read at the end to reduce latency in stack operations

• cfn test passes: ================== 12 passed, 7 warnings in 208.31s (0:03:28) ==================
• Integration tests:

Before this change:

With this change:

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