[Keyboard] Sejin EAT-1010R2 keyboard (#19809)

Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: jack <0x6a73@protonmail.com>

added Polly40 keyboard (#19936)

Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: jack <0x6a73@protonmail.com>

[Keymap] Drashna updates for 0.20.0 (#19960)

Merge remote-tracking branch 'upstream/develop'

Move encoder config to data driven (#19923)

Co-authored-by: Nick Brassel <nick@tzarc.org>

Move backlight config to data driven (#19910)

Reallocate SAFE_RANGE (#19909)

Migrate some more layouts to data driven (#19889)

Move QMK LUFA bootloader config to data driven (#19879)

VIA Protocol 12 + fixes (#19916)

Co-authored-by: Wilba <wilba@wilba.tech>
Co-authored-by: zvecr <git@zvecr.com>

Remove default and unused `BACKLIGHT_LEVELS` (#19898)

Add some missing `#pragma once`s (#19902)

Move backlight config to data driven, part 1 (#19887)

Move layouts for direct_pins boards to data driven (#19872)

Fix more build failures (#19869)

Move `SOFT_SERIAL_PIN` to data driven (#19863)

Remove matrix size defines (#19581)

Move LED indicator config to data driven (#19800)

Move Bootmagic config to data driven (#19860)

Remove unused RGBLight defines from config.h (#19859)