[JUnit Platform] Delay plugin creation until test execution

[mpkorstanje]

Fixes: #2441

[codecov]

Codecov Report

Merging #2442 (2069fb8) into main (71674ca) will increase coverage by 0.08%.
The diff coverage is 100.00%.

❗ Current head 2069fb8 differs from pull request most recent head 80d4cc8. Consider uploading reports for the commit 80d4cc8 to get more accurate results

@@             Coverage Diff              @@
##               main    #2442      +/-   ##
============================================
+ Coverage     83.67%   83.76%   +0.08%     
- Complexity     2648     2670      +22     
============================================
  Files           317      319       +2     
  Lines          9349     9411      +62     
  Branches        907      910       +3     
============================================
+ Hits           7823     7883      +60     
- Misses         1192     1193       +1     
- Partials        334      335       +1     

Impacted Files	Coverage Δ
...latform/engine/CucumberEngineExecutionContext.java	86.66% <100.00%> (+1.30%)	⬆️
.../java/io/cucumber/guice/InjectorSourceFactory.java	96.87% <0.00%> (-3.13%)	⬇️
.../src/main/java/io/cucumber/guice/GuiceBackend.java	100.00% <0.00%> (ø)
...io/cucumber/guice/GuiceBackendProviderService.java	100.00% <0.00%> (ø)
.../src/main/java/io/cucumber/guice/GuiceFactory.java	94.11% <0.00%> (+3.20%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 71674ca...80d4cc8. Read the comment docs.