fix(otel): fix doctests

[lcian]

The doctests show usage from the point of view of the sentry crate, as we are importing the subcrate as use sentry::integrations::opentelemetry as sentry_opentelemetry;.
Therefore the first doctest will not compile.
The second will also not compile because we have the imports in the first.
Let's just use ignore on both of them.

[Swatinem]

you can still run these doctests by pulling in the main sentry crate as a dev dependency.
we use this pattern in the doctests for sentry-core itself.

We are abusing dependency cycles in a very creative way here. Not really a fan of it tbh, but it kinda works.

[lcian]

you can still run these doctests by pulling in the main sentry crate as a dev dependency. we use this pattern in the doctests for sentry-core itself.

We are abusing dependency cycles in a very creative way here. Not really a fan of it tbh, but it kinda works.

Ah cool, we were actually already pulling sentry as a dev dependency for the test feature, didn't think that pulling opentelemetry itself would work :)
I guess cargo is not this dumb :)