fix(isISO6346): anchor regex alternation and remove stray comma

[DucMinhNe]

The isISO6346 validator accepts strings it should reject because of an un-grouped regex alternation.

The bug

const isISO6346Str = /^[A-Z]{3}(U[0-9]{7})|([J,Z][0-9]{6,7})$/;

| has the lowest precedence, and the two branches are not wrapped in a group, so the pattern actually parses as:

(^[A-Z]{3}(U[0-9]{7}))   OR   (([J,Z][0-9]{6,7})$)

The first branch is anchored only at the start and the second only at the end. As a result:

• a valid prefix followed by arbitrary trailing characters matches the first branch, and
• arbitrary leading characters followed by a valid suffix match the second branch.

Additionally, the character class [J,Z] matches a literal comma, which is never a valid ISO 6346 category identifier.

Reproduction

const validator = require("validator");

validator.isISO6346("ABCU1234567GARBAGE"); // => true  (expected false)
validator.isISO6346("GARBAGEZ123456");     // => true  (expected false)
validator.isISO6346("XYZ,123456");         // => true  (expected false)

These all return true today. Because the checksum block only runs when str.length === 11, the un-anchored false positives bypass validation entirely.

The fix

Wrap the alternation in the existing group and drop the stray comma, so the whole string is anchored:

const isISO6346Str = /^[A-Z]{3}(U[0-9]{7}|[JZ][0-9]{6,7})$/;

This is the same class of fix already applied to other anchored-alternation validators in this project.

Tests

• Added regression cases (ABCU1234567GARBAGE, GARBAGEZ123456, XYZ,123456) to the isISO6346 / isFreightContainerID invalid lists.
• All existing valid cases (including the J/Z short forms like QJRZ123456) still pass.
• Full validators suite passes (249 passing) and eslint src test is clean.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7fdc788) to head (b3516be).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2771   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          114       114           
  Lines         2587      2587           
  Branches       656       656           
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  Hits          2587      2587           

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