Add labels to `DNSRecord`s

[hown3d]

How to categorize this PR?

/area usability /kind enhancement

What this PR does / why we need it: Adds labels to DNSRecords created for each shoot. This allows to use label selectors to only get the DNSRecords that are used for the Kubernetes API server.

Release note:

gardenlet now adds labels for `DNSRecord` resources created for `Shoot` control planes. This allows using label selectors to target `DNSRecord`s used for `Shoot` control plane components.

[gardener-prow[bot]]

Hi @hown3d. Thanks for your PR.

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[rfranzke]

/ok-to-test

[hown3d]

For the sake of completeness, should we also add a label to the ingress record (ref)?

I agree, added the labels on that record too.

[marc1404]

Test Integration ResourceManager NodeAgentAuthorizer Suite: [BeforeSuite]

FAILED] Expected success, but got an error:
    <*net.OpError | 0xc00089a2d0>: 
    listen tcp 127.0.0.1:32853: bind: address already in use
    {
        Op: "listen",
        Net: "tcp",
        Source: nil,
        Addr: <*net.TCPAddr | 0xc000d86390>{
            IP: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 127, 0, 0, 1],
            Port: 32853,
            Zone: "",
        },
        Err: <*os.SyscallError | 0xc000894520>{
            Syscall: "bind",
            Err: <syscall.Errno>0x62,
        },
    }
In [BeforeSuite] at: /home/prow/go/src/github.com/gardener/gardener/test/integration/resourcemanager/nodeagentauthorizer/nodeagentauthorizer_suite_test.go:250 @ 11/17/25 12:54:52.972

---

Test Integration Gardenlet BackupEntry Suite: [It] BackupEntry controller tests migrate should set the BackupEntry status as Succeeded if the extension BackupEntry is migrated successfully

[FAILED] Expected success, but got an error:
    <*errors.StatusError | 0xc004e2c1e0>: 
    Internal error occurred: backupbucket.core.gardener.cloud "foo-czl6c" not found
    {
        ErrStatus: {
            TypeMeta: {Kind: "", APIVersion: ""},
            ListMeta: {
                SelfLink: "",
                ResourceVersion: "",
                Continue: "",
                RemainingItemCount: nil,
            },
            Status: "Failure",
            Message: "Internal error occurred: backupbucket.core.gardener.cloud \"foo-czl6c\" not found",
            Reason: "InternalError",
            Details: {
                Name: "",
                Group: "",
                Kind: "",
                UID: "",
                Causes: [
                    {
                        Type: "",
                        Message: "backupbucket.core.gardener.cloud \"foo-czl6c\" not found",
                        Field: "",
                    },
                ],
                RetryAfterSeconds: 0,
            },
            Code: 500,
        },
    }
In [JustBeforeEach] at: /home/prow/go/src/github.com/gardener/gardener/test/integration/gardenlet/backupentry/backupentry_test.go:314 @ 11/17/25 12:53:29.689

---

/test pull-gardener-integration

[timuthy]

/test pull-gardener-e2e-kind-gardenadm

[hown3d]

/retest

[ialidzhikov]

/assign

[ialidzhikov]

@hown3d , I pushed fc7f0017a584c55d43c581b9f25ca3c5ccf8b593 to fix the failing unit test.

[gardener-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ialidzhikov, timuthy

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[gardener-prow[bot]]

LGTM label has been added.

Git tree hash: 65227c5195874f4609b73a0a4d2bccac69fae24e

[ialidzhikov]

/test pull-gardener-e2e-kind-gardenadm