refactor(antithesis): Reorganization of antithesis tooling

[graphcareful]

Summary

Reorganizes some of the antithesis tooling to enable re-use of items such as dockerfiles and core shared test components such as the oracle.

Vector configuration

No change to Vector itself.

How did you test this PR?

Running some of the existing antithesis runs to ensure they run to completion.

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

Notes

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