DX fix and legacy js cleanup

[vedanshshetti]

Summary

This PR improves consistency, type safety, and documentation across the logger utilities and Kibana formatter in the SAP Cloud SDK.

Motivation

The SDK follows a strict TypeScript style with explicit return types, consistent JSDoc usage, and modern idiomatic patterns. Several functions were missing return types, one used a legacy has()/get() pattern, and sanitizeRecord used any instead of unknown. This PR aligns these areas with the rest of the codebase.

Changes

• Added explicit void return types to toggleMuteLoggers and toggleSilenceTransports
• Added JSDoc to toggleMuteLoggers and kibanaTransformer
• Replaced redundant has() check in getLogger with direct get() access
• Replaced any with unknown in sanitizeRecord for improved type safety

Notes

No behavioral changes. All tests pass.

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[vedanshshetti]

Hi, your bot is saying I didnt sign the CLA, even though I did.