Backport of 3697 Respect @coversNothing at coverage driver start

[andrewnicols]

As discussed in #3699, this is a backport to 7.5.

[codecov]

Codecov Report

Merging #3709 into 7.5 will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                7.5    #3709      +/-   ##
============================================
+ Coverage     83.37%   83.38%   +0.01%     
- Complexity     3645     3646       +1     
============================================
  Files           143      143              
  Lines          9712     9714       +2     
============================================
+ Hits           8097     8100       +3     
+ Misses         1615     1614       -1

Impacted Files	Coverage Δ	Complexity Δ
src/Framework/TestResult.php	75.73% <100%> (+0.11%)	170 <0> (+1)	⬆️
src/Util/Test.php	94.1% <0%> (+0.19%)	217% <0%> (ø)	⬇️

---

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 1426ca6...b129ab0. Read the comment docs.