[CI] Include the teamcity-messages library and display the build name

Summary:
The library will be used for other messages later, such as pushing the
artifacts.

Test Plan:
Look at the logs of the builds for this diff and check the message is
printed.

Reviewers: #bitcoin_abc, jasonbcox

Reviewed By: #bitcoin_abc, jasonbcox

Differential Revision: https://reviews.bitcoinabc.org/D6732