Update gempak scripts to be complaint with static bash code analysis checkers

[WalterKolczynski-NOAA]

Description

Updates the gempak scripts to be compliant with the static bash code analysis checkers.

Mostly just white-space changes with this one except:

• Renaming a couple scripts to add .sh extension
• Replacing arithmetic statements with regular bash tests in if-statements

Type of change

• Maintenance (code refactor, clean-up, new CI test, etc.)

Change characteristics

• Is this change expected to change outputs (e.g. value changes to existing outputs, new files stored in COM, files removed from COM, filename changes, additions/subtractions to archives)? NO
• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO
• Does this change require an update to any of the following submodules? NO

How has this been tested?

• Only static tests (no access to WCOSS to test gempak)

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
• I have documented my code, including function, input, and output descriptions
• My changes generate no new warnings
• New and existing tests pass with my changes
• This change is covered by an existing CI test or a new one has been added
• Any new scripts have been added to the .github/CODEOWNERS file with owners
• I have made corresponding changes to the system documentation if necessary

[aerorahul]

looks good to me.

[DavidHuber-NOAA]

Launching CI on WCOSS2.

[DavidHuber-NOAA]

All tests passed. Merging.