Fix flaky AppInsights DI tests

[martinothamar]

Description

Hopefully fixes flaky DI tests for App Insights.
Example race: https://github.com/Altinn/app-lib-dotnet/actions/runs/8967112868/job/24623968605

Related Issue(s)

• Race condition in AppInsights test #633

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)
• All tests run green

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[ivarne]

I'm not sure I understand what this test is really verifying, but if this is less likely to cause DI failures it's good with me.

[martinothamar]

We had an issue a little while back where AppInsights logs weren't being shipped. This was tracked down to AppInsights SDK silently giving up on an error condition where it couldn't handle keyed services in the DI container. See this test as an example:

The other PR is #594
In the next major version we will hopefully drop App Insights SDK, so then we can remove all this junk 😄

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud