Add real slice validation for all printers (#14771)

# Description

Adds a --slice (-s) mode to the profile validator that slices a
two-colour cube through every shipped printer, expanding all custom
g-code (change_filament_gcode, machine start/end, etc.). This catches
invalid-placeholder / bad-flow / slicing errors that the static JSON
checks and unit tests can't see.

Included:
- Validator: new -s sweep mode; per-profile error attribution in the
log; resolves the synthetic 2nd-filament nozzle-mapping so multi-nozzle
BBL printers (incl. the Direct-Drive+Bowden X2D) validate cleanly.
- CI, two complementary paths:
- check_profiles.yml — runs the sweep on profile-only PRs (nightly
binary).
- build_all.yml — new parallel slice_check_linux job runs it on
engine/src PRs with the PR-built binary (build_all doesn't trigger on
resources/**, so no overlap). Runs off the build's artifact, so it
doesn't lengthen the build leg.
- Profile fixes surfaced by the sweep: Creality, FLSun, Ginger, Qidi,
RatRig, iQ.
- Engine: whitelist BBL firmware T-opcodes (T1001/T65279/T65535) in the
time estimator (log-only, no g-code change); dedupe a
per-filament/per-layer log flood in get_config_index.

# Screenshots/Recordings/Graphs

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## Tests

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src/libslic3r/Print.hpp

@@ -1303,6 +1303,10 @@ private:
     FilamentIndexMap m_filament_index_map;
     // Used to cache printer and process parameter information
     PrintIndexMap m_nozzle_index_map;
+    // Orca: filament ids already reported as missing a nozzle-group entry this slice. get_config_index()
+    // falls back per-filament/per-layer in the g-code hot path, so this dedupes its log to once per
+    // filament instead of flooding thousands of identical error lines. Cleared with the caches each slice.
+    std::set<int> m_missing_nozzle_group_logged;
     // save the config value of "filament_self_index"
     std::vector<int> m_filament_self_index;