feat(call): add option to enable blur background by default for all c…

[DorraJaouad]

…onversations

☑️ Resolves

It's default settings, meaning that if this config is on, the blur effect will apply automatically and it's up to user to change it before joining the call.

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

Talk Settings	Media Settings

🚧 Tasks

• Clean previous browserStorage usage

🏁 Checklist

• 🌏 Tested with different browsers / clients:
  • Chromium (Chrome / Edge / Opera / Brave)
  • Firefox
  • Safari
  • Talk Desktop
  • Not risky to browser differences / client
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required

[nickvergessen]

I don't recall what we store in the local storage so far. its a "type" (string?) and in case type is image we also store the "name of the image" (string?) or what do we store?

[DorraJaouad]

We store 3 info: enabled, type, and (url) if it is an image

[nickvergessen]

We store all 3 in the backend in the future?

[DorraJaouad]

We store all 3 in the backend in the future?

That's a better behavior IMO (not reliant on browser). Will it stay per conversation level or we change to one setting for all conversations?

[nickvergessen]

The API stored config has to be 1 for all, otherwise we save too many preferences?

[Antreesy]

Acceptable

[Antreesy]

Perfecto

Please rebase, remove composer files and re-split into commits (backend -> openapi -> frontend?)

[nickvergessen]

/backport to stable30

[nickvergessen]

PHP code is fine!