PERF: more realistic np datetime c benchmark
See my comments in #57951. This change in the benchmark input range has more coverage of the different logic branches in `np_datetime.c`. The benchmark should run about 1.8x as long (most likely a little bit machine dependent) after merging this.

Keeping this separate from my other PR #57988 that improves the `np_datetime.c`performance to distinguish the benchmark impacts.

@WillAyd 

This pull request is stale because it has been open for thirty days with no activity. Please [update](https://pandas.pydata.org/pandas-docs/stable/development/contributing.html#updating-your-pull-request) and respond to this comment if you're still interested in working on this. Thanks @dontgoto 