Error backend turned off by default

Added

• Add Appsignal.Span.set_name_if_nil helper. This helper can be used to not overwrite previously set span names, and only set the span name if it wasn't set previously. This will used most commonly in AppSignal created integrations with other libraries to allow apps to set custom span names.

Changed

• Turn error backend off by default. This will prevent errors from being reported without much context. If you're missing errors after this change, set the enable_error_backend config option to true, and let us know what errors you're missing at support@appsignal.com.
• Add debug and error logs to probes to better track what it's doing. This is helpful when debugging issues with the minutely probes system.

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See the Elixir package 2.11.0 changelog for more information.