ci(prow): add OWNERS and OWNERS_ALIASES

[petersutter]

What this PR does / why we need it:
Add OWNERS and OWNERS_ALIASES as preparation for enabling prow

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

[gardener-robot]

@holgerkoser, @klocke-io, @grolu You have pull request review open invite, please check

[grolu]

/lgtm

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/lifecycle stale

[gardener-robot]

@gardener-ci-robot Command /add is not available to you but only to a Maintainer, Member, Author.

[gardener-ci-robot]

The Gardener project currently lacks enough active contributors to adequately respond to all PRs.
This bot triages PRs according to the following rules:

• After 15d of inactivity, lifecycle/stale is applied
• After 15d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 7d of inactivity since lifecycle/rotten was applied, the PR is closed

You can:

• Mark this PR as fresh with /remove-lifecycle stale
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/lifecycle stale

[dimityrmirchev]

/remove-lifecycle stale

Can we please merge this if there are no objections?

friendly ping @grolu @petersutter @klocke-io

[oliver-goetz]

/cherry-pick hotfix-1.83

[gardener-ci-robot]

@oliver-goetz: new pull request created: #2813

Details

In response to this:

/cherry-pick hotfix-1.83

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