util.inspect: fix numericSeparator for scientific notation numbers

When numericSeparator: true is set, util.inspect produces corrupted output
like '1e-.1e-_7' for numbers in scientific notation.

The fix adds an early return in formatNumber() for scientific notation
numbers (containing 'e') before the decimal-split + numeric separator
logic runs.

Fixes #62981

Author: AmSach

lib/internal/util/inspect.js

@@ -2210,6 +2210,11 @@ function formatNumber(fn, number, numericSeparator) {
     return fn(numberString, 'number');
   }
 
+  // Scientific notation cannot have numeric separators applied sensibly
+  if (StringPrototypeIncludes(numberString, 'e')) {
+    return fn(numberString, 'number');
+  }
+
   const decimalIndex = StringPrototypeIndexOf(numberString, '.');
   const integerPart = StringPrototypeSlice(numberString, 0, decimalIndex);
   const fractionalPart = StringPrototypeSlice(numberString, decimalIndex + 1);