Date: createFromDateString bad-token Warning → Unexpected character (#31575)

[PurHur]

Summary

• Align DateInterval::createFromDateString('@@@') Warning detail with Zend/php-src: Unexpected character instead of the timezone-database leak path.
• Alphabetic tokens like foo still use The timezone could not be found in the database (unchanged).
• PHP-side fix in ext/standard/VmDateInterval.php (parseFromDateString); no new runtime/ C.

Closes #31575

php-src reference

• ext/date/php_date.c — zim_DateInterval_createFromDateString
• ext/date/lib/parse_date.re — unexpected-character diagnostics

Test plan

• Issue repro (Zend + VM)
• ./script/phpunit.sh --filter 'Issue31575DateIntervalBadTokenWarnTest|DateIntervalCreateFromDateStringBadTokenWarn31575VMTest'
• Related empty/null createFromDateString VM guards still green

Verification

$ ./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_dateinterval_createfromdatestring_warn.php'
return=false
warning=DateInterval::createFromDateString(): Unknown or bad format (@@@) at position 0 (@): Unexpected character

$ ./script/phpunit.sh --filter 'Issue31575DateIntervalBadTokenWarnTest|DateIntervalCreateFromDateStringBadTokenWarn31575VMTest'
OK (2 tests, 3 assertions)

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