bp #53050
Related PR: #40695
Problem Summary:
pr #40695 introduced the function `from_iso8601_date`, which parses the
string to get year、mouth、 day, and sets the date value through the
`set_time_unit` function.
Since `set_time_unit` lacks some judgment on mouth, it may get an
illegal date in the end, which may cause core in debug mode.
sql : `select from_iso8601_date('2023-00-01');`
```
F20250709 09:50:14.366984 3587796 vdatetime_value.h:1222] Check failed: date_v2_value_.month_ != 0
*** Check failure stack trace: ***
@ 0x559bd7050d96 google::LogMessage::SendToLog()
@ 0x559bd704d7e0 google::LogMessage::Flush()
@ 0x559bd70515d9 google::LogMessageFatal::~LogMessageFatal()
@ 0x559bc725a570 doris::DateV2Value<>::set_time_unit<>()
@ 0x559bc7257380 doris::vectorized::FromIso8601DateV2::execute()
@ 0x559bc7255a88 doris::vectorized::FunctionOtherTypesToDateType<>::execute_impl()
@ 0x559bc09e0781 doris::vectorized::DefaultExecutable::execute_impl()
@ 0x559bc423aa20 doris::vectorized::PreparedFunctionImpl::_execute_skipped_constant_deal()
@ 0x559bc4234938 doris::vectorized::PreparedFunctionImpl::execute_without_low_cardinality_columns()
@ 0x559bc4233f42 doris::vectorized::PreparedFunctionImpl::default_implementation_for_nulls()
@ 0x559bc423a773 doris::vectorized::PreparedFunctionImpl::_execute_skipped_constant_deal()
@ 0x559bc4234938 doris::vectorized::PreparedFunctionImpl::execute_without_low_cardinality_columns()
@ 0x559bc4234a57 doris::vectorized::PreparedFunctionImpl::execute()
```
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
None
### Check List (For Author)
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- [ ] Yes. <!-- Explain the behavior change -->
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