Add back E2E tests for 1ES official pipeline

[andystaples]

Due to increased security constriants, E2E tests were removed for the 1ES pipeline. We need to do the following to get them working again:

1. Figure out how to connect to KeyVault in 1ES private pipeline to run the Azure tests on public releases
2. Decide how much of the E2E logic we want running in the public pipeline, and refactor them to use Azure Storage Emulator/similar for purely local tests using Core Tools