🐛 Don't put tags from AWS subnet into the subnetSpec

[fiunchinho]

What type of PR is this?

/kind bug

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 and fixes #5121

Special notes for your reviewer:

Checklist:

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

Release note:

Don't put tags from AWS subnet into the subnetSpec

[k8s-ci-robot]

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[fiunchinho]

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

[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-e2e	9b14493	link	false	/test pull-cluster-api-provider-aws-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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