Remove the `requireConfiguration` option

[ematipico]

We discussed this internally, and we agreed that this option must go.

Biome can resolve its configuration perfectly fine, and if it doesn't, it uses the default behaviour.

The reason why we added this configuration was because "people don't want to see diagnostics if they aren't in a biome project". While this is true, this hides how powerful Biome is. People can still disable the extension if they need.

We want users to download the extension and start using it straightaway because that's what Biome is. Good defaults and configuration are not needed. This is the message we want to send.