[3.5] Ignore done tasks (#3500)

[asvetlov]

• Fix web._cancel_all_tasks causes spurious errors on Python <3.7 #3497: Ignore done tasks when cancels pending activities on web.run_app finalization.
  (cherry picked from commit 4e99e81)

Co-authored-by: Andrew Svetlov [email protected]

[codecov-io]

Codecov Report

Merging #3503 into 3.5 will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              3.5    #3503      +/-   ##
==========================================
- Coverage   97.93%   97.92%   -0.02%     
==========================================
  Files          44       44              
  Lines        8563     8565       +2     
  Branches     1381     1382       +1     
==========================================
+ Hits         8386     8387       +1     
  Misses         72       72              
- Partials      105      106       +1

Impacted Files	Coverage Δ
aiohttp/helpers.py	96.74% <100%> (+0.01%)	⬆️
aiohttp/web.py	99.1% <0%> (-0.9%)	⬇️

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