Auto generate dark mode previews and screenshots (#776)

With this change, composable previews and screenshots should be created with just:
```
@ElementPreviews
@Composable
fun MyViewPreview() {
    ElementPreview { 
        MyView()
    }
}
```

- Adds `@ElementPreviews` which is a shorthand for:
```
@Preview(name = "D")
@Preview(name = "N", uiMode = Configuration.UI_MODE_NIGHT_YES)
```
Should be used in connection with the now public `fun ElementPreview()` composable.

- Adds ElementPreviews to previewAnnotations in dangerfile
- Screenshots of night mode previews are now rendered with night mode
- Replaces `ElementPreviewLight` and `ElementThemedPreview` with `ElementPreview`
- Deprecates `ElementPreviewDark` which should be removed.
- Remaining usages of `ElementPreviewDark` are now ignored during screenshot tests

features/location/api/src/main/kotlin/io/element/android/features/location/api/StaticMapView.kt

@@ -29,7 +29,7 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.tooling.preview.Preview
+import io.element.android.libraries.designsystem.preview.ElementPreviews
 import androidx.compose.ui.unit.IntOffset
 import androidx.compose.ui.unit.dp
 import coil.compose.AsyncImagePainter
@@ -38,8 +38,8 @@ import coil.request.ImageRequest
 import io.element.android.features.location.api.internal.AttributionPlacement
 import io.element.android.features.location.api.internal.StaticMapPlaceholder
 import io.element.android.features.location.api.internal.buildStaticMapsApiUrl
+import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.ElementPreviewDark
-import io.element.android.libraries.designsystem.preview.ElementPreviewLight
 import io.element.android.libraries.designsystem.text.toDp
 import io.element.android.libraries.designsystem.theme.components.Icon
 import io.element.android.libraries.theme.ElementTheme
@@ -127,12 +127,13 @@ fun StaticMapView(
     }
 }
 
-@Preview
+@ElementPreviews
 @Composable
-fun StaticMapViewLightPreview() =
-    ElementPreviewLight { ContentToPreview() }
+fun StaticMapViewLightPreview() {
+    ElementPreview { ContentToPreview() }
+}
 
-@Preview
+@ElementPreviews
 @Composable
 fun StaticMapViewDarkPreview() =
     ElementPreviewDark { ContentToPreview() }

features/location/api/src/main/kotlin/io/element/android/features/location/api/internal/StaticMapPlaceholder.kt

@@ -29,13 +29,13 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.tooling.preview.Preview
+import io.element.android.libraries.designsystem.preview.ElementPreviews
 import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import androidx.compose.ui.unit.dp
 import io.element.android.features.location.api.R
+import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.ElementPreviewDark
-import io.element.android.libraries.designsystem.preview.ElementPreviewLight
 import io.element.android.libraries.designsystem.theme.components.CircularProgressIndicator
 import io.element.android.libraries.designsystem.theme.components.Icon
 import io.element.android.libraries.designsystem.theme.components.Text
@@ -83,13 +83,15 @@ internal fun StaticMapPlaceholder(
     }
 }
 
-@Preview
+@ElementPreviews
 @Composable
 fun StaticMapPlaceholderLightPreview(
     @PreviewParameter(BooleanParameterProvider::class) values: Boolean
-) = ElementPreviewLight { ContentToPreview(values) }
+) {
+    ElementPreview { ContentToPreview(values) }
+}
 
-@Preview
+@ElementPreviews
 @Composable
 fun StaticMapPlaceholderDarkPreview(
     @PreviewParameter(BooleanParameterProvider::class) values: Boolean