Fix role ARN comparison for user ID strict check

[DanielCKennedy]

What this PR does / why we need it:

Fixes UserID strict ARN comparison for roles by comparing mapped arn against the identity's canonical arn (role representation) rather than the identity's arn (assume role format). Additionally strips the role path off of the dynamic file role mapping for this check since assumed roles don't have path info.

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 #

[k8s-ci-robot]

Hi @DanielCKennedy. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[nnmin-aws]

/test

[k8s-ci-robot]

@nnmin-aws: The /test command needs one or more targets.
The following commands are available to trigger required jobs:

• /test pull-aws-iam-authenticator-e2e
• /test pull-aws-iam-authenticator-e2e-kind
• /test pull-aws-iam-authenticator-integration
• /test pull-aws-iam-authenticator-unit

Use /test all to run all jobs.

In response to this:

/test

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[nnmin-aws]

/test all

[nckturner]

/ok-to-test

[nnmin-aws]

/retest

[nckturner]

Can you add a // TODO: that says something along the lines of: this should potentially be moved to canonicalize or somehow shared by other mappers because it could fix the path issue but needs to be tested with other mappers first, e.g. in a cluster with existing custom resources for the CRD mapper.

[nckturner]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DanielCKennedy, nckturner

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[k8s-ci-robot]

@DanielCKennedy: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-aws-iam-authenticator-e2e	e91d159	link	true	/test pull-aws-iam-authenticator-e2e

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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