Transcripts filter content

[SergioEstevao]

Refs #1848

This PR improves the display of the transcript by applying filters to the content, in order to remove Speaker information and better layout the text depending of the existence of paragraphs.

https://github.com/Automattic/pocket-casts-ios/assets/651601/e6b0f8c4-5a56-4431-a117-54bec639630e

To test

• Start the app
• Ensure that you have the transcripts and newShowNotesEndpoint FF enabled
• Start playing an episode with Transcript support. Ex: Any episode The Audacity to Podcast
• Open the full screen player
• Tap on the transcript tabs
• See that the layout of text, is respecting paragraphs and no "Speaker" entries or other xml kind of tags <> are present on on the text.

Checklist

• [x] I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• [ ] I have considered adding unit tests for my changes.
• [x] I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.