Append the Crossplane provider name to the Terraform user agent

[clareliguori]

Signed-off-by: Clare Liguori liguori@amazon.com

Description of your changes

Related to https://github.com/crossplane/provider-aws/issues/1241, this updates the user agent that Terraform uses for AWS requests, so they can be disambiguated in CloudTrail from other Terraform requests that may use the same credentials/role.

I have:

• [x] Read and followed Crossplane's contribution process.
• [x] Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

Created an ECR repo using the provider and got the following user agent in CloudTrail:

"userAgent": "APN/1.0 HashiCorp/1.0 Terraform/1.0.5 (+https://www.terraform.io) terraform-provider-aws/3.56.0 (+https://registry.terraform.io/providers/hashicorp/aws) aws-sdk-go/1.40.29 (go1.16; linux; amd64) crossplane-provider-jet-aws/v0.4.0-30.g2f6b907c.dirty"

[negz]

Thanks @clareliguori! Glad this was more straightforward than I had feared. 😄