Result based caching

[pmelab]

Revert the cache context detection back to pulling them from the results directly.

See #584

[codecov]

Codecov Report

Merging #586 into 8.x-3.x will decrease coverage by 0.36%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           8.x-3.x     #586      +/-   ##
===========================================
- Coverage    80.73%   80.37%   -0.37%     
===========================================
  Files          186      185       -1     
  Lines         2860     2843      -17     
===========================================
- Hits          2309     2285      -24     
- Misses         551      558       +7

Impacted Files	Coverage Δ
src/GraphQL/Execution/QueryProcessor.php	91.32% <100%> (-0.1%)	⬇️
.../Plugin/GraphQL/Interfaces/InterfacePluginBase.php	75% <0%> (-21.88%)	⬇️

---

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 e44f86a...e3859d5. Read the comment docs.