✨ Support ignition v3 and presigned URLs

[vincepri]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR adds support for more versions of ignition, based on the work the @JoelSpeed started in https://github.com/openshift/cluster-api-provider-aws/pull/475/files.

It includes the ability for CAPA to generate presigned URLs and not rely on IAM roles.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #4491

Special notes for your reviewer:

Checklist:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

Release note:

Ignition v3 is now supported as a valid version. S3 Bucket to store bootstrap data can now optionally use presigned URLs instead of relying on IAM permissions for nodes and control-plane nodes. The feature is opt-in and backward compatible, if you'd like to switch using presigned URLs, set `AWSCluster.S3Bucket.PresignedURLDuration`.

[vincepri]

/assign @nrb @JoelSpeed @richardcase

[nrb]

This looks pretty reasonable to me.

The only thing that gives me pause is the release note being one line; it could be taken to imply that the ignition and presigned URL support are coupled, but I don't believe they are.

[vincepri]

Manual testing was performed, and presigned URLs worked great 🎉

[JoelSpeed]

Changes look reasonable to me, I've already tested and manually verified the ignition v3 changes

[Skarlso]

Manual testing was performed, and presigned URLs worked great 🎉

Can you please include some basic proof for statements like these?

[Skarlso]

Also, some issues would be great so we could discuss them and their usefulness.

[JoelSpeed]

Here's an example of a user data created by this patch when using the IAM roles, showing backward compatibility, and version 3.4 of ignition is used

[Skarlso]

/lgtm

Should be okay after rebase.

[Ankitasw]

/test pull-cluster-api-provider-aws-e2e

[vincepri]

/retest

failure is not related

[vincepri]

/retest

[Ankitasw]

/lgtm
/approve

[k8s-ci-robot]

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