Avoid modifying the PATH for the python test suites #1453

Job	Run time
Compile the UX-less version of the app on Nano S+ for performance tests	1m 32s
Compilation for X, S+, Stax and Flex (nanox, $NANOX_SDK)	1m 57s
Compilation for X, S+, Stax and Flex (nanosp, $NANOSP_SDK)	1m 50s
Compilation for X, S+, Stax and Flex (stax, $STAX_SDK)	2m 0s
Compilation for X, S+, Stax and Flex (flex, $FLEX_SDK)	2m 6s
Performance report	3m 52s
Tests with the Python library and legacy Bitcoin app	55s
Tests with the JS library	1m 23s
Unit test	1m 24s
Tests on mainnet (nanox)	43s
Tests on mainnet (nanosp)	44s
Tests for rust client library	1m 42s
Tests on mainnet (stax)	44s
Tests on mainnet (flex)	41s
	21m 33s

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