chore: Updates Project CFN resource handler to accept Lambda Proxy ARN as input & use as Http transport in Atlas SDK client#1300

maastha wants to merge 3 commits intomastermongodb/mongodbatlas-cloudformation-resources:masterfrom

spike-lambda-vpc-ipaddrmongodb/mongodbatlas-cloudformation-resources:spike-lambda-vpc-ipaddrCopy head branch name to clipboard