[GPG migration] Remove static private key, pass GPG_PRIVATE_KEY

[Mahesh-Binayak]

as secret

• Deleted .github/keys/mosipgpgkey_sec.gpg (private key now stored as GPG_PRIVATE_KEY repo secret)
• Updated all kattu workflow refs from master-java21 to mahesh-patch-1
• Added GPG_PRIVATE_KEY secret passthrough to build and publish jobs

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