Cdp-backend

Fix from v3.0.7, move the `yt-dlp` import to within the `youtube_copy` function to avoid dependency import failure during infrastructure management.

What's Changed
* bugfix/move-yt-dlp-import-to-within-youtube-copy-func by JacksonMaxfield in https://github.com/CouncilDataProject/cdp-backend/pull/171


**Full Changelog**: https://github.com/CouncilDataProject/cdp-backend/compare/v3.0.7...v3.0.8

A quick patch to add functionality to download and process videos from YouTube URLs.

What's Changed
* feature/downloading-youtube-videos by Shak2000 in https://github.com/CouncilDataProject/cdp-backend/pull/169


**Full Changelog**: https://github.com/CouncilDataProject/cdp-backend/compare/v3.0.6...v3.0.7

Contributors
Shak2000
JacksonMaxfield
isaacna

This patch fixes the indexing pipeline that has been failing for Seattle for a while: https://github.com/CouncilDataProject/seattle-staging/actions?query=workflow%3A%22Event+Index%22

The bug was caused by a pictogram / emoji in the transcript, as such, during indexing, we strip all pictogram like characters:
bugfix/clean-pictograms-from-transcripts-before-indexing by JacksonMaxfield in https://github.com/CouncilDataProject/cdp-backend/pull/165

This fixes a bug introduced in the v3.0.4.

See: bugfix/revert-validator-fixes by JacksonMaxfield in https://github.com/CouncilDataProject/cdp-backend/pull/164

A lot of these changes simply make it easier to use this library (and the data) in Python (and other systems). However notably, this PR is shipping with a new database change that isn't _required_ but is recommended. See the "running-extra-scripts.md" file in the admin-docs/ directory after updating your deployment repository with the latest changes from cookiecutter.

What's Changed
* feature/truncate-sentences-in-transcript-str by isaacna in https://github.com/CouncilDataProject/cdp-backend/pull/153
* bug/catch-timeout-in-event-gather by isaacna in https://github.com/CouncilDataProject/cdp-backend/pull/157
* feature/store-session-content-hash-in-session-db-model by isaacna in https://github.com/CouncilDataProject/cdp-backend/pull/158
* feature/script-for-retroactive-session-content-hashing by isaacna in https://github.com/CouncilDataProject/cdp-backend/pull/159
* feature/role-title-constants by dphoria in https://github.com/CouncilDataProject/cdp-backend/pull/155
* feature/remove-is-required-from-constant-validator by isaacna in https://github.com/CouncilDataProject/cdp-backend/pull/163

**Full Changelog**: https://github.com/CouncilDataProject/cdp-backend/compare/v3.0.3...v3.0.4

This patch release is actually a minor improvement to Google Speech-to-Text. While we don't have exact improvement measures, it is apparent and details can be seen in 150.

We will be working on an actual word-error-rate calculation soon to measure these improvements in the future.