fix(secret): print confirmation on IPsec secret create/update

[bhumikadangayach]

Fixes #1940

kmeshctl secret create printed nothing on success - no indication whether it created a new secret or rotated an existing one, or what the new SPI is. Running create twice silently rotated the live key with zero output.

CreateOrUpdateSecret in ctl/secret/secret.go returned silently after both the Create and Update branches. Added a fmt.Printf after each confirming the action and SPI.

Verified locally against a kind cluster:

$ kmeshctl secret create
IPsec secret created (SPI: 1)

$ kmeshctl secret create --key=...
IPsec secret updated (SPI: 2)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.58%. Comparing base (c6357aa) to head (96da608).
⚠️ Report is 14 commits behind head on main.
see 3 files with indirect coverage changes

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