The SetDefaultAttributes call in CaptureLog overwrites user-set attributes from the configureLog callback

[jamescrosswell]

This is not a new problem, but existing behavior, that we now add more default attributes that potentially overwrite user-defined attributes. Previously, we would overwrite

• sentry.environment

• sentry.release

• sentry.sdk.name

• sentry.sdk.version

We could open a follow-up to change this behavior.

This is technically a change in behavior, so we might want to do this in the next major (v7.0.0).

But we probably do want to do this, because with Metrics we did get it right where user-attributes might overwrite default-attributes.

Originally posted by @Flash0ver in #5216

[linear-code]

NET-728

[Flash0ver]

Not sure yet if bug fix (patch) or breaking change (major).
In Metrics, we got the precedence right (first apply SDK default attributes, then apply user-defined attributes).