Testimony summarization -- Just look at hearing_overview_pipeline.py

[danielblauvelt]

Summary

Add a short summary of the changes, and a reference to the original issue using # and the issue number, like #1
Created a pipeline that takes in a testimony hearing and provides an AI overview of what was discussed during the hearing.

Checklist

• On the frontend, I've made my strings translate-able.
• If I've added shared components, I've added a storybook story.
• I've made pages responsive and look good on mobile.

Screenshots

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Known issues

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Steps to test/reproduce

For each feature or bug fix, create a step by step list for how a reviewer can test it out. E.g.:

1. Go to the home page
2. Click on a testimony
3. See that it's loaded with a loading spinner

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[Mephistic]

For reference, here's the the issue for actually implementing the pipeline to generate these summaries on an ongoing basis: #1840

Feel free to use this PR for just the initial work to support a function that can take a Hearing + Transcription Text and generate a summary - we can then wrap it and backfill old transcriptions once the blockers listed in that issue are removed.