Improve error message provided by Reqnroll.Microsoft.Extensions.DependencyInjection plugin when a test execution dependent service is required during [BeforeTestRun]

[gasparnagy]

🤔 What's changed?

Added a more descriptive error message to Reqnroll.Microsoft.Extensions.DependencyInjection plugin for the case when a test execution dependent service is required during [BeforeTestRun].

⚡️ What's your motivation?

Before this fix and error like System.Collections.Generic.KeyNotFoundException : The given key 'Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope' was not present in the dictionary. was thrown.

Fixes #175.

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, etc. without changing behaviour)

♻️ Anything particular you want feedback on?

n/a

📋 Checklist:

• I've changed the behaviour of the code
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "[vNext]" section of the CHANGELOG, linking to this pull request & included my GitHub handle to the release contributors list.

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