I need to know, if all AWS provided ami comes with aws cli pre installed?
No. AWS makes AMIs available officially in the marketplace and they do not all have the CLI preinstalled. Even AMIs that you can obtain that are maintained by AWS directly do not all have the CLI tools installed by default.
Not all AMIs will have it preinstalled. For general purposes, use the Amazon Linux 2 AMI. This has the AWS CLI preinstalled, along with many other packages.