Activate registry graceful shutdown

[dimitar-kostadinov]

How to categorize this PR?

/area robustness /kind enhancement

What this PR does / why we need it: Sets registry http.draintimeout configuration option to 25 seconds. After registry process receives SIGTERM signal, it will gracefully shuts down the server and wait 25 sec for active connections to drain.

Which issue(s) this PR fixes: Part of #3

Special notes for your reviewer:

Release note:

Registry configuration option `http.draintimeout` is set to 25 seconds to activate registry graceful shutdown.

[gardener-prow[bot]]

LGTM label has been added.

Git tree hash: 6cbb5a6c7147774edb63b66c03612e9e4a6257ae

[gardener-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ialidzhikov

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/gardener/gardener-extension-registry-cache/blob/main/OWNERS)~~ [ialidzhikov] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ialidzhikov]

  [FAILED] Expected success, but got an error:
      <*errors.errorString | 0xc000f8bcc0>: 
      failed to verify no running pods after hibernation: found pods in namespace shoot--local--e2e-cache-hib: [etcd-events-0]
      {
          s: "failed to verify no running pods after hibernation: found pods in namespace shoot--local--e2e-cache-hib: [etcd-events-0]",
      }
  In [It] at: /home/prow/go/src/github.com/gardener/gardener-extension-registry-cache/test/e2e/cache/create_enabled_hibernate_reconcile_delete.go:51 @ 03/05/24 18:49:40.022

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Doesn't seem to be related to the registry-cache.

/test pull-gardener-extension-registry-cache-e2e-kind