27249 Followup, re order preflight-checks.py

[ellensp]

Description

Followup to #27249

As it is currently preflight-checks.py does not correctly detect and fix "#if BOTH()" or "#if EITHER()"

At present it does this

Verbose mode can be enabled via `-v, --verbose` option
In file included from buildroot/share/PlatformIO/scripts/../../../../Marlin/src/inc/MarlinConfigPre.h:39:0,
                 from buildroot/share/PlatformIO/scripts/../../../../Marlin/src/inc/MarlinConfig.h:28,
                 from buildroot/share/PlatformIO/scripts/common-dependencies.h:29:
buildroot/share/PlatformIO/scripts/../../../../Marlin/src/inc/../../Configuration.h:74:9: error: missing binary operator before token "("
 #if BOTH()
         ^
Error: Failed to parse Marlin features. See previous error messages.

The cause is preflight-checks attempts to load all MARLIN_FEATURES before checking for the invalid MACROS

Reordering preflight-checks.py and it now warns and updated the macro as expected.

Verbose mode can be enabled via `-v, --verbose` option
In file included from buildroot/share/PlatformIO/scripts/../../../../Marlin/src/inc/MarlinConfigPre.h:39:0,
                 from buildroot/share/PlatformIO/scripts/../../../../Marlin/src/inc/MarlinConfig.h:28,
                 from buildroot/share/PlatformIO/scripts/common-dependencies.h:29:
buildroot/share/PlatformIO/scripts/../../../../Marlin/src/inc/../../Configuration.h:74:9: error: missing binary operator before token "("
 #if BOTH()
         ^
WARNING: Configuration files needed an update to remove incompatible items. Try the build again to use the updated files.

Requirements

Old "#if BOTH()" or "#if EITHER()" in Configuration files.

Benefits

Works as expected

Related Issues

#27249