Detect SSD1306 and SH1106 screens on RAK boards

Use repeated status reads at screen initialization and preserve SSD1306 for ambiguous responses. Share the existing framebuffer, drawing, rotation and power handling; use SH1106 page transfers when detected.

Enable this for RAK4631 and RAK3401, including WisMesh Pocket v2/v3. Add controller overrides, protocol tests and CI coverage. Addresses meshcore-dev/MeshCore#3296.

.github/workflows/run-unit-tests.yml

@@ -996,6 +996,7 @@ jobs:
           python3 -B test/test_legacy_ui_version_bounds.py -v
           python3 -B test/test_infrastructure_ui_version.py -v
           python3 -B test/test_ssd1306_power.py -v
+          python3 -B test/test_oled_display_probe.py -v
           python3 -B test/test_companion_inbox.py
           python3 -B test/test_heltec_r8_external_power.py
           python3 -B test/test_bluetooth_mac_contract.py