4.6.3.1-rc1 Release: stability fixes

[akshar-airbound]

Moved all fixes done on Plane-4.5.7 to Plane-4.6.3
Includes fix for test_chibios autotest ci fail.

Test page
https://www.notion.so/airbound/4-6-3-Porting-Testing-of-4-6-3-1-rc1-rc2-2a821adf4be9808a82bedf4f7af789d8

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[botmayank]

lgtm