[WIP] Add HPA fallback external metrics blog

[omerap12]

Description

Issue

KEP: kubernetes/enhancements#5679

Closes: #

[k8s-ci-robot]

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• content/en/blog/OWNERS

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[lmktfy]

Just so you know, blog article PRs always need to target main. Something to bear in mind once you have had your first round of draft and peer (buddy) feedback.

[chadmcrowell]

Hi @omerap12 👋 v1.36 Communications team here,

@mortent as author of #54567, I'd like you to be a writing buddy for @omerap12 on this PR.

Please:

• Review this PR, paying attention to the guidelines and review hints
• Update your own PR based on any best practices you identify that should be applied
• Remember to be compassionate with your fellow article author