Two combine-static updates

[ceblanton]

Describe your changes

1. For non-regridded cubed-sphere output, static pp file should be tiled
2. Remove unneeded and problematic coordinates variable attribute from split-out static files before merging them into the static pp file.

Issue ticket number and link (if applicable)

Checklist before requesting a review

• I ran my code
• I tried to make my code readable
• I tried to comment my code
• I wrote a new test, if applicable
• I wrote new instructions/documentation, if applicable
• I ran pytest and inspected it's output
• I ran pylint and attempted to implement some of it's feedback
• No print statements; all user-facing info uses logging module

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[singhd789]

I think you said mentioned a while ago that you were working on adding to a test, so I'll just comment for now. Other than that, I think this looks good to go!

[singhd789]

I think this looks good!