Filter out AWS internal tags when reconciling

[fiunchinho]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Tags that start with aws: are considered internal AWS tags and can't be add or removed.

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 #5120

Special notes for your reviewer:

Checklist:

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

Release note:

Filter out AWS internal tags when reconciling AWS infra

[k8s-ci-robot]

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[fiunchinho]

I inlined the BuildParams object on each test case to make it easier to see what's being tested.

[k8s-ci-robot]

@fiunchinho: 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-cluster-api-provider-aws-test	3ef7e0f	link	true	/test pull-cluster-api-provider-aws-test

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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