Merge branch 'bugfix/mbedtls_tests' into 'master'

fix mbedtls unit tests, fix IDF_VER when building a project outside ESP-IDF tree

- mbedTLS test needs about 5% more time to run (in debug mode) when building with 5.2.0, compared to 4.8.5. Increase the timeout to let the test pass.
- when doing `git describe` in IDF_VER definition, `-C $(IDF_PATH)` is needed to get the version of ESP-IDF, and not the project being built (which may not even be in git)

See merge request !411

diff --cc make/project.mk
Simple merge