Added missing schema option

[dragosprotung]

No description provided.

[ste93cry]

Thank you for the contribution, can you please add an entry to the CHANGELOG?

[dragosprotung]

Done

[Jean85]

@ste93cry how did this pass with the tests? Do we miss something there?

[dragosprotung]

The integration tests do not validate the XML configuration against the schema.
The field does appear in the tests (see https://github.com/getsentry/sentry-symfony/blob/master/tests/DependencyInjection/Fixtures/xml/full.xml#L29)

[ste93cry]

Do we miss something there?

Yes we do, the messenger config node is missing in tests/DependencyInjection/Fixtures/xml/full.xml and this caused the tests to not break by fallbacking to the default value for the option and covering the issue

The integration tests do not validate the XML configuration against the schema.

False, I explained above why the tests didn't break. Try adding the option without your change and Symfony will complain with [ERROR 1866] Element '{https://sentry.io/schema/dic/sentry-symfony}messenger', attribute 'capture-soft-fails': The attribute 'capture-soft-fails' is not allowed.. Would you mind opening a new PR to add the missing attribute and fix the tests?

[dragosprotung]

Ah, i confused capture-silenced-errors with capture-soft-fails in the xml fixtures. Opened #420