avtFileFormat::GuessCycle() called for every file name in a series except the first

[markcmiller86]

Describe the bug

In debugging #20080, I discovered that avtFileFormat::GuessCycle() is called for all files in a series except the first (or perhaps the state being opened). This means that the cycle associated with the first state in a series is currently always displaying as zero (0) in the time slider.

This is an issue somewhere else in VisIt where VisIt is deciding not to call avtFileFormat::GuessCycle().

I suspect if one opened a time series of 10 files at state (index) 5, then it could wind up declaring that state 0 and all the other states it would call avtFileFormat::GuessCycle() from. In other words, it probably is using guesses only for states other than the state being used to open the series (which defaults to the first state but doens't mandate that). So, there is probably an optimization that says "hey, since I am opening at state k, don't guess the cycle for that state, just get the cycle from the opened file...and then that is failing, but guess the cycle for all other states."