Update creating a workspace to set IMDSv2 to optional on instance

[IsaacMurtagh]

When creating a Cloud9 environment the default setting is to require IMDSv2. This documentation relies uses IMDSv1 to make calls to the metadata endpoint. Therefore, this change adds steps to change IMDSv2 from required to optional during workspace setup.

The alternative is to change all documentation to use IMDSv2, but that's a bigger change and for consistency would require changes to the app repositories used in this workshop.

Also changed the images for modifying and attaching a role to an instance for consistent UI during setup.

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[IsaacMurtagh]

From this release note: https://aws.amazon.com/about-aws/whats-new/2024/03/set-imdsv2-default-new-instance-launches
Mar 25, 2024

Now, when enabled, any new instances launched from your account will be IMDSv2-only by default. IMDS default settings are specific to individual AWS regions in your account.

[IsaacMurtagh]

Issue: #135