Remove 'classic' brand from pulumi-aws and reccomend it for new projects

[mjeffryes]

A few changes to package docs and tips to avoid steering people to using aws-native that don't have a good reason to:

• Remove the "Classic" branding from the pulumi-aws provider in docs
• Change the "package alerts" to not promote aws-native on aws resources and unambiguously recommend the bridged provider for new projects from aws-native resources
• Remove the note promoting aws-native from the bridged provider index page
• Tweak the wording on the note in the aws-native provider index to unambiguously recommend the bridged provider for new projects.

Towards https://github.com/pulumi/pulumi-aws-native/issues/1698 and https://github.com/pulumi/pulumi-aws-native/issues/1697

fixes https://github.com/pulumi/pulumi-aws-native/issues/1699

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