Improvements from code review #1465

Job	Run time
Compile the UX-less version of the app on Nano S+ for performance tests	1m 29s
Compilation for X, S+, Stax and Flex (nanox, $NANOX_SDK)	2m 1s
Compilation for X, S+, Stax and Flex (nanosp, $NANOSP_SDK)	1m 54s
Compilation for X, S+, Stax and Flex (stax, $STAX_SDK)	2m 23s
Compilation for X, S+, Stax and Flex (flex, $FLEX_SDK)	2m 5s
Performance report	3m 47s
Tests on mainnet (nanox)	47s
Tests on mainnet (nanosp)	46s
Tests for rust client library	1m 44s
Tests with the Python library and legacy Bitcoin app	58s
Tests on mainnet (stax)	42s
Tests with the JS library	1m 14s
Tests on mainnet (flex)	40s
Unit test	1m 24s
	21m 54s

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