[hi] Localize admission-controller.md

[rajyavardhan01]

What this PR does / why we need it

This PR localizes the admission-controller glossary entry to Hindi.

File added: content/hi/docs/reference/glossary/admission-controller.md

Which issue(s) this PR fixes

Fixes part of https://github.com/kubernetes/website/issues/35935

Special notes for your reviewer

• Translated from English source at content/en/docs/reference/glossary/admission-controller.md
• Technical terms like "Kubernetes", "API server" are transliterated to Hindi (कुबेरनेट्स, API सर्वर)
• "validating" translated as "प्रमाणीकरण" and "mutating" as "परिवर्तन"

/language hi

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[rajyavardhan01]

Hi @dipesh-rawat requesting to review this PR and let me know if there is anything needed. Thanks