chore(code-quality): reduce cyclomatic complexity of podSource.Endpoints()

[vflaux]

What does it do ?

Reduce cyclomatic complexity (30) of podSource.Endpoints() in source/pod.go .

Motivation

#5419

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[k8s-ci-robot]

Hi @vflaux. Thanks for your PR.

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[ivankatliarchuk]

/ok-to-test

[ivankatliarchuk]

Shell we get that change in first?

[mloiseleur]

/lgtm

[ivankatliarchuk]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ivankatliarchuk

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[ivankatliarchuk]

Flakey test https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_external-dns/5498/pull-external-dns-unit-test/1931039043810758656. Not sure related or not

[ivankatliarchuk]

Fixes #5470