New functionality to run test-only builds using conda packages

This MR introduces three new features:

1. A new command bdt test can run test-only conda-builds using tarballs created during a build phase
2. An equivalent new command bdt ci test can be used to run test-only builds on the CI
3. A template inside single-package.yaml can be used among packages to run specific test-only builds of themselves

added 1 commit

• ddb10658 - [scripts][test] Fix minor typo

Compare with previous version

merged

mentioned in commit c48694da