[WE-205] sanitize paths when replacing {runtime.platform.path}

[rsora]

This PR fixes a path generation in upload command in windows environment:

Error has this form for Arduino WiFi Rev2:
Flashing with command:C:/Users/per/.arduino-create/arduino/avrdude/6.3.0-arduino14/bin/avrdude.exe -CC:/Users/per/.arduino-create/arduino/avrdude/6.3.0-arduino14/etc/avrdude.conf -v -patmega4809 -cxplainedmini_updi -Pusb -b115200 -e -D -Uflash:w:C:/Users/per/AppData/Local/Temp/arduino-create-agent248491772/sketch_feb28a.hex:i -Ufuses:w:C:UsersperAppDataLocalTempextrafiles293253675/fuses/fuses_4809.bin:r

-Ufuses:w:C:UsersperAppDataLocalTempextrafiles293253675/fuses/fuses_4809.bin:r

should be

-Ufuses:w:C:/Users/per/AppData/Local/Temp/extrafiles293253675/fuses/fuses_4809.bin:r

this has properly tested on all 3 platforms

[matteosuppo]

LGTM. I propose to add a test for this case but for it to be effective we need to test automatically on all platforms