Calendar component - errors when adding and configuring layers

[yuliaGradova]

When working with the Calendar component, two errors occur:

1. "Value must not be null" - appears when trying to add a layer
2. "useMetadata must be used within a MetadataProvider" - appears when clicking Configure layer

To Reproduce
For Issue 1:

1. Add a Calendar component to the page/form
2. Go to its configuration/settings
3. Click Add layer
4. Observe the error: "Value must not be null"

For Issue 2:

1. Add a Calendar component to the page/form
2. Go to its configuration/settings
3. Click Configure layer on an existing layer
4. Observe the error: "useMetadata must be used within a MetadataProvider"

Expected behavior
Adding a layer should work without errors
Clicking Configure layer should open the configuration panel without errors

Screenshots