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

---------

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

scripts/fbt_tools/fbt_apps.py

@@ -150,11 +150,22 @@ def DumpApplicationConfig(target, source, env):
     print(fg.boldgreen("Firmware modules configuration:"))
     for apptype in FlipperAppType:
         app_sublist = env["APPBUILD"].get_apps_of_type(apptype)
-        if app_sublist:
+        # Print a warning if any apps in the list have same .order value
+        unique_order_values = set(app.order for app in app_sublist)
+        if len(app_sublist) != len(unique_order_values) and max(unique_order_values):
+            print(
+                fg.red(f"{apptype.value}: ")
+                + fg.yellow(
+                    "Duplicate .order values in group:\n\t"
+                    + ", ".join(f"{app.appid} ({app.order})" for app in app_sublist)
+                )
+            )
+        elif app_sublist:
             print(
                 fg.green(f"{apptype.value}:\n\t"),
                 ", ".join(app.appid for app in app_sublist),
             )
+
     if incompatible_ext_apps := env["APPBUILD"].get_incompatible_ext_apps():
         print(
             fg.blue("Incompatible apps (skipped):\n\t"),