fix(isISO6346): anchor the whole pattern and drop the stray comma

[rajanpanth]

Fixes #2772.

The ISO 6346 pattern's alternation was not grouped:

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

so ^ anchored only the U branch and $ only the J/Z branch, and [J,Z] contained a literal comma. Three classes of malformed input validated:

isISO6346('ABCU1234567HELLO') // true: trailing junk ignored by the U branch
isISO6346('JUNKJ1234567')     // true: leading junk ignored by the J/Z branch
isISO6346('AB,1234567')       // true: comma accepted as a category identifier

Inputs whose length is not 11 skip the check-digit computation entirely, so these returned true with no checksum at all.

The corrected pattern groups the alternation, drops the comma, and requires the three-letter owner code on the J/Z branch too, which the standard mandates for all containers:

/^[A-Z]{3}(?:U[0-9]{7}|[JZ][0-9]{6,7})$/

All existing fixtures pass unchanged, including QJRZ123456 (J/Z with 6 digits, no check digit) and the checksum-digit-10 cases. Three regression inputs added to the invalid lists of both isISO6346 and isFreightContainerID.

Verification: 252 passing; reverting the source change alone and rebuilding fails exactly the 2 updated test blocks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a79ff98) to head (8ca6048).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2857   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          114       114           
  Lines         2599      2599           
  Branches       658       658           
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  Hits          2599      2599           

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