feat: Add optional path variable for the platform_team_eks_access aws_iam_policy

[nadaj]

What does this PR do?

Adds an optional path variable for the platform_team_eks_access aws_iam_policy.

Motivation

Needed a custom path for the resource aws_iam_policy.platform_team_eks_access, since the roles used to deploy the resources have strict permissions on certain policy paths.

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I have added a new example under examples to support my PR
• Yes, I have created another PR for add-ons under add-ons repo (if applicable)
• Yes, I have updated the docs for this feature
• Yes, I ran pre-commit run -a with this PR

Note: Not all the PRs require a new example and/or doc page. In general:

• Use an existing example when possible to demonstrate a new addons usage
• A new docs page under docs/add-ons/* is required for new a new addon

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[bryantbiggs]

do you have roles with paths (not "/" but something else) that access the cluster today? I think you will find issues with trying to connect to the cluster with roles with custom paths due to kubernetes-sigs/aws-iam-authenticator#268

[nadaj]

I have paths that have a prefix in the policies e.g. arn:aws:iam::<account>:policy/<path_prefix><policy_name> and it is working in my case.

[bryantbiggs]

ah, my apologies - I overlooked that this was for a policy and not for a role. This should be ok to add once you've resolved the CI checks