Previously, we uploaded SARIF artifacts in the `analyze-post` step and database and log artifacts in the `init-post` step. As we migrate to the updated `artifact` dependencies, we want to switch to uploading all artifacts in one step.

In order to upload all artifacts in one go and maintain the artifacts at the root of the debug directory, we first move SARIF artifacts to the database directory. This should not affect any other consumers of the SARIF file as this occurs in the `init-post` step.

Previously, we uploaded combined SARIF artifacts in both the `analyze-post` and `upload-sarif-post` steps. This change ensures that these artifacts are uploaded at most once — in `analyze-post` if it is a first-party run and `upload-sarif-post` if it is a third-party run.

This is a defensive check because as we upgrade to the new `artifact` dependencies we will not be able to upload artifacts to the same artifact directory.

More accurately describes what these artifacts are, rather than the step they're uploaded in.