fbt: Deterministic STARTUP order & additional checks (#4179)

* unit_tests: clear startup order

* fam: ensure unique STARTUP order

* fbt: warn on same .order values within a group leading to non-determinitic builds

* fbt: better formatting for app order warning

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Co-authored-by: hedger <hedger@nanode.su>

applications/services/locale/application.fam

@@ -4,6 +4,6 @@ App(
     apptype=FlipperAppType.STARTUP,
     entry_point="locale_on_system_start",
     cdefines=["SRV_LOCALE"],
-    order=90,
+    order=70,
     sdk_headers=["locale.h"],
 )