[CI] Cross build and run the tests for Linux 32 bits

Summary:
Prevent regression on 32 bits Linux.
Note: the previously failing test has been removed, it's all green now.

Supersedes D5897.

Test Plan:

../contrib/teamcity/build-configurations.py build-linux32

Reviewers: #bitcoin_abc, jasonbcox

Reviewed By: #bitcoin_abc, jasonbcox

Differential Revision: https://reviews.bitcoinabc.org/D7227