Update Release Lead Handbook and Lead Progress Template#2866

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Vyom-Yadav wants to merge 3 commits intokubernetes:masterfrom

Vyom-Yadav:v1.34-retro-lead-items

Commits on Sep 14, 2025

Better define responsibilities of lead shadows and update release directory structure
Vyom-Yadav
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Update lead progress issue template with current release state
Vyom-Yadav
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Commits on Sep 16, 2025

Update lead handbook and progress template after access control reivew
Vyom-Yadav
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