The Problem

Currently, the struture of the checksums in a repro test experiment running on Gadi are the following:

$EXPERIMENT_LOCATION/
└── checksum/
    ├── historical-*hr-checksum.json
    └── test_report.xml

And the structure of the checksums in the repo are:

.
└── testing/
    └── checksum/
        ├── historical-*hr-checksum.json
        └── test_report.xml

In which, in the CI, we special-case the logic for creating the intermediate testing directory in the repo. This also creates problems for the inputs.additional-artifact-content-paths, which are, confusingly, in the correct place at both the experiment level and the repo level, which means they both have to be handled differently.

The Solution

This PR unifies the checksum directories so that both the experiment and repo reflect the following structure:

$EXPERIMENT_LOCATION_OR_REPO_ROOT/
└── testing/
    └── checksum/
        ├── historical-*hr-checksum.json
        └── test_report.xml

In this PR:

• test-repro.yml: put checksums under ./testing directory in artifact and experiment to mimic default repo structure
• generate-checksums.yml: put checksums under ./testing directory in artifact and experiment to mimic default repo structure
• Updated the creation and usage of artifacts to account for the new ./testing directory for checksums

NOTE: There is a unhealthy amount of duplication of effort in the PR, especially in test-repro/generate-checksums (see 34b7697 and 37518f4). This will be rectified in #72.

NOTE: This is required to merge #73

Closes #75