Add go:embedded files to skaffold dependencies

[maboehm]

How to categorize this PR?
/area dev-productivity
/kind enhancement

What this PR does / why we need it:
Adds dependencies introduced by embedded files to skaffold.yaml. Unfortunately, go list does not recursively resolve embeddings, so we have to approximate, by checking every (indirect) local dependency. This includes some false positives, since this does not check if the embedding is actually used, but I think its good enough.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Release note:

`Skaffold` now rebuilds components if embedded files have changed.

[gardener-prow]

Hi @maboehm. Thanks for your PR.

I'm waiting for a gardener 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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[maboehm]

FYI: IMO we should not sort the dependencies that we retrieved from the current config, so I removed this

[timebertt]

/ok-to-test

[rfranzke]

Cool. Thank you!

/lgtm
/approve
/retest

[gardener-prow]

LGTM label has been added.

Git tree hash: 9b6fc442bbdd6991f7d13c3168975dad6d56f48b

[gardener-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rfranzke

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[gardener-prow]

@maboehm: 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-gardener-e2e-kind-ha-single-zone-upgrade	344e5c4	link	unknown	/test pull-gardener-e2e-kind-ha-single-zone-upgrade

Full PR test history. Your PR dashboard. Command help for this repository.
Please help us cut down on flakes by linking this test failure to an open flake report or filing a new flake report if you can't find an existing one. Also see our testing guideline for how to avoid and hunt flakes.

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[maboehm]

/retest