Fix CREATE DATABASE failure when model DB has large files (#676)

[erikdarlingdata]

Summary

• Fixes [BUG] Create Database PerformanceMonitor Doesn't Account For model DB #676 — installer fails with error 1803 when model database files are larger than our hardcoded defaults (1024MB data, 256MB log)
• Two layers of protection:
  1. Pre-check: query sys.master_files for model's file sizes, use MAX(model, default). Wrapped in TRY/CATCH for restricted permissions, NULL-safe.
  2. Retry on error 1803: if CREATE DATABASE still fails, parse the required MB from the error message (language-independent — searches for digits before " MB") and retry once.

Test plan

• Error message parsing tested with English and German error formats
• NULL/empty result handling verified (falls back to defaults)
• Syntax validated on sql2022 (existing DB path)
• Full reinstall on sql2016 (same version as reporter) — 54 files, 45 collectors, clean

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