[Developer Issue]: Need GitHub actions to turn off FIMS_DEBUG_LOG()

[kellijohnson-NOAA]

Description

In dev and other branches, FIMS_DEBUG_LOG() can be used to add debugging statements to the log file if -DFIMS_DEBUG is added the the makevars file. We want to have a GitHub action that removes this flag from the Makevars and Makevars.win files prior to merging anything into main. Second, we want to have a GitHub action that uses grep or something to stop all PR to main that have FIMS_DEBUG_LOG statements in the code.

This is not super pressing at the moment b/c no branch actually has this flag turned on but it will be needed in M3 at a minimum.