[seer-by-sentry]

Fixes CLIENT-1R1. The issue was that: Static object destruction order causes ICU time zone code to read null memory after custom string allocator frees a buffer.

• Converted AsciiString::TheEmptyString and UnicodeString::TheEmptyString from static objects to static references pointing to intentionally leaked instances (*new T()).
• This change implements the "leaky singleton" pattern to avoid the Static Destruction Order Fiasco (SDOF).
• Prevents potential crashes during application exit caused by system libraries (like ICU) accessing the empty string constants after they have been destroyed.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 8180635

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