First installment for running w/ replay.

[aerorahul]

Description

This PR:

• does not turn ON replay
• adds functionality to run with replay initial conditions at the end of the assimilation window
• REPLAY can be performed with warm or cold starts. Cold starts requires an update to the ufs-weather-model past PR update cubed sphere gitmodules for perturbation/increments for cold starts ufs-community/ufs-weather-model#2271
• collects all restart dates that need to be copied to COM in a list and then loops over the dates.
• adds functions to create restart and cold start FV3 files so they can be used and not be repeated.

A flag REPLAY_ICS should be set to YES in config.base or config.fcst if want to use replay ICS
Running with replay requires perturbation files pretending to be increments as that is the mechanism for generating ensemble ics from deterministic restarts.

Type of change

• New feature (adds functionality)

Change characteristics

• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO

How has this been tested?

Ran forecast jobs on Hera for forecast-only

Checklist

• Any dependent changes have been merged and published
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing tests pass with my changes
• I have made corresponding changes to the documentation if necessary

[aerorahul]

@NeilBarton-NOAA I should perhaps open this PR against your replay PR.

[NeilBarton-NOAA]

@aerorahul that makes more sense in my opinion.

[aerorahul]

@aerorahul that makes more sense in my opinion.

@aerorahul that makes more sense in my opinion.
Thanks @NeilBarton-NOAA
I opened one against the branch in your PR
NeilBarton-NOAA#3