Postman collection for AWS Security Hub app

[mishalp-crest]

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[mishalp-crest]

Need to add postman_collection.json to the exclude.txt list.

Hey @gary-phantom , We are not adding exclude_files.txt for the open-source apps. We had also discussed this with @brian-phantom and he had told us that we do not need to create exclude_files.txt for apps on Github.