Fix IMDSv2 test to allow /tmp to be immutable

[t0yv0]

The IMDSv2 test provisions a RC of the pulumi-aws-provider inside an AWS test account and checks if it can authenticate. Unfortunately something changed in the cloud that no longer permits unix programs to make changes to /tmp. The test relied to this for no good reason; the updated version creates a dedicated folder /home/ec2-user/repro to perform the check.

Fixes https://github.com/pulumi/pulumi-aws/issues/4670

[github-actions[bot]]

Does the PR have any schema changes?

Looking good! No breaking changes found. No new resources/functions.

Maintainer note: consult the runbook for dealing with any breaking changes.

[pulumi-bot]

This PR has been shipped in release v6.57.0.