Add trailing comma via suffixLast when addCommaAfterEachArgument is false

[ruudk]

Summary

When addCommaAfterEachArgument is false in dumpCall, no commas were added at all. PHP CS Fixer expects a trailing comma on the last argument in multiline function calls.

This changes the false behavior to use suffixLast(',', $args) instead of just $args, adding a comma only to the last argument line. This is useful for multi-line constructs like match expressions used as function arguments:

// Before (no trailing comma after })
Type::nonNull(
    match (true) {
        $a => $this->getType('Foo'),
        default => $this->getType('Bar'),
    }
)

// After (trailing comma on last argument only)
Type::nonNull(
    match (true) {
        $a => $this->getType('Foo'),
        default => $this->getType('Bar'),
    },
)

Both the static call path and object call path are updated.

Test plan

• Added tests for both static and iterable object call paths
• Full test suite passes (167 tests, 308 assertions)