Fix PowerShell $ escaping and indentation in GenBuildInfo.ps1

[Copilot]

Inside a PowerShell expandable (double-quoted) string, an unescaped $ triggers variable interpolation. The two C# interpolated-string literals ($"...") were being silently mangled — PowerShell would attempt to expand the following token as a variable, effectively dropping the $ from the generated .cs file.

Changes

• $ escaping — Replaced bare $ with `$ on the two affected lines so the literal $ is preserved in the generated C# output:

  # Before — $ gets interpolated/dropped by PowerShell
  public static readonly string BuildDateStringUtc = $`"{BuildDateUtc:f}  (UTC)`";
  
  # After — `$ emits a literal $ in the output file
  public static readonly string BuildDateStringUtc = `$`"{BuildDateUtc:f}  (UTC)`";

• Indentation — Fixed VersionString declaration which had 7 leading spaces instead of the consistent 4 used by all other class members.

[Copilot]

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