Late Initialize OpenID Connect Provider Thumbprints

[knottnt]

Issue #, if available: 2450

Description of changes:
Update the OpenID Connect Provider resource to late initialize the Thumbprints field when not provided. This avoids invalid requests being made to UpdateOpenIDConnectProviderThumbprint due to the Thumbprints field being nil.

• Mark OpenIDConnectProvider.Thumbprints as a late_initialize field in generator.yaml
• Add e2e test to verify that the Thumbprints field is populated with the value in AWS following creation of the resource and that subsequent reconcile doesn't trigger an invalid UpdateOpenIDConnectProviderThumbprint request.
• Add .vscode to .gitignore

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

@knottnt: 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
iam-verify-attribution	e23b8fe	link	false	/test iam-verify-attribution

Full PR test history. Your PR dashboard.

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[rushmash91]

/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: knottnt, rushmash91

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