[Core] Emit exceptions on failure to handle test run finished events

[mpkorstanje]

🤔 What's changed?

The runtime would collect exceptions thrown upon emitting the TestRunFinished
event. The assumption was that these were collected in the test context.
Though this is impossible. The test context is collecting exceptions to include
in the report. So it sits inside the test run started and finished events.

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• 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 "Unreleased" section of the CHANGELOG, linking to this pull request.

[codecov]

Codecov Report

Merging #2651 (e76ad72) into main (d9a5afd) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main    #2651   +/-   ##
=========================================
  Coverage     84.77%   84.77%           
  Complexity     2686     2686           
=========================================
  Files           322      322           
  Lines          9532     9532           
  Branches        903      903           
=========================================
  Hits           8081     8081           
  Misses         1120     1120           
  Partials        331      331           

Impacted Files	Coverage Δ
...rc/main/java/io/cucumber/core/runtime/Runtime.java	92.92% <100.00%> (ø)

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