Profile tool: list the retired belt keys as obsolete (#16240)

Gets the `belt-printer` CI green again after #16236:

- **Check profiles**: the profile tool's unit test
`test_obsolete_keys_match_the_loader_ignore_set` compares
`OBSOLETE_KEYS` with the loader's ignore set in
`PrintConfigDef::handle_legacy()`, which gained the twelve retired belt
keys. Adds them to the tool's list.
- **clang-tidy**: `tests/fff_print/test_print.cpp` used `std::sqrt`
without `<cmath>` (misc-include-cleaner).

Verification:
- `python3 -m unittest discover -s scripts/tests -t scripts`: 281 tests
pass.
- `scripts/orca_profile_tool.py check`: no errors.
- `scripts/clang_tidy_diff.py -p build-tidy --base upstream/main` on
this head, i.e. every line the belt branch changes against `main` (100
files, the same check the *Merge Belt Printing Into Upstream* PR runs):
no findings.

scripts/orca_profile_tool.py

@@ -167,6 +167,11 @@ OBSOLETE_KEYS = {
     "filament_load_time", "filament_unload_time", "smooth_coefficient",
     "overhang_totally_speed", "silent_mode", "overhang_speed_classic",
     "anisotropic_surfaces",
+    # Belt printer options retired before the feature shipped (#16236).
+    "belt_slice_rotation_global", "preslice_remap_x", "preslice_remap_y", "preslice_remap_z",
+    "preslice_remap_global", "belt_support_z_offset_mode", "first_layer_plane",
+    "first_layer_plane_offset", "belt_preslice_global", "gcode_back_transform",
+    "belt_support_floor_mode", "first_layer_plane_thickness",
 }
 
 # Keys renamed at some point, whose old and new spellings must never co-exist:

tests/fff_print/test_print.cpp

@@ -34,6 +34,7 @@
 #include "libslic3r/ExtrusionEntity.hpp"
 #include "libslic3r/Polyline.hpp"
 #include <limits>
+#include <cmath>
 #include "libslic3r/Polygon.hpp"
 #include "libslic3r/Model.hpp"
 #include "libslic3r/GCodeReader.hpp"