SurrealDB server requires variable SURREAL_TELEMETRY_PROVIDER to be set to otlp to enable exporters.
This PR overrides WithOtlpExporter method to ensures this variable is set.

PR Checklist

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• PR doesn't include merge commits (always rebase on top of our main, if needed)
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Contains NO breaking changes
• Every new API (including internal ones) has full XML docs
• Code follows all style conventions

Other information

Can't get the test to work with:

var config = await surrealServer.Resource.GetEnvironmentVariablesAsync();

bool hasValue = config.TryGetValue("SURREAL_TELEMETRY_PROVIDER", out var value);

Assert.True(hasValue);
Assert.Equal("otlp", value);

Anyway, I found a workaround.