fix: add missing dep files to manifest (#2516)
### Summary
Closes #2484. Adds missing dependency files to `MANIFEST.in` so they are
included in the Python distribution. Also updates the manifest to look
for ingest dependencies in the `requirements/ingest` subdirectory.
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Co-authored-by: qued <64741807+qued@users.noreply.github.com>
Co-authored-by: Ahmet Melek <39141206+ahmetmeleq@users.noreply.github.com>
