tests-bal@v7.3.0

This release targets the final bal-devnet-7 release providing additional test coverage (no spec changes) on top of v7.2.0.

PTAL at the test release tracker for more information: #2912

See v7.1.0, v7.1.1 and v7.2.0 release notes for the full set of bal-devnet-7 spec changes.