Stabilize SmokeTests.PrometheusExporter

[pellared]

Why

(hopefully) Fixes #978

What

Lower the HTTP Client so that the test takes shorter time and retries the HTTP request.

Tests

CI

Checklist

• CHANGELOG.md is updated.
• Documentation is updated.
• New features are covered by tests.

[nrcventura]

In the issue description, you mention the adding of a retry mechanism. Is that at the test level? Or is the intention for that to be at the request level?

[pellared]

In the issue description, you mention the adding of a retry mechanism. Is that at the test level? Or is the intention for that to be at the request level?

At the test level:

opentelemetry-dotnet-instrumentation/test/IntegrationTests/SmokeTests.cs

Lines 179 to 181 in 63ea03c

	await assert.Should().NotThrowAfterAsync(
	waitTime: 30.Seconds(),
	pollInterval: 1.Seconds());