Prevent generation of 'year 0 is out of range' strings in IT

[thirtiseven]

fixes #9916

This PR fixes some DataGen(StringGen) which generated out of range data in IT.

The regex:

'(0{0,3}1-(0?[2-9]|[1-3][0-9]))|(([0-9]{0,3}[2-9]|[1-9][0-9]{0,2}[01])-[0-3]?[0-9])-[0-5]?[0-9]'

can generated data start from 01-02-01, and keeps the invalid date as negative cases.

A simple breakdown:
(0{0,3}1-(0?[2-9]|[1-3][0-9])): 'valid' months in year 1, e. g. 001-2, 1-30
(([1-9][0-9]{0,2}[01])-[0-3]?[0-9]): years end with but not only 0, 1, all months.
(([0-9]{0,3}[2-9])-[0-3]?[0-9]): years end with 2-9, all months.

Tested with large data locally without failed, and the coverage looks as excepted.

[thirtiseven]

build