Add another await publisher to debug flaky ReadingResourcesService tests

[codecov-commenter]

Codecov Report

Merging #420 (0852ac8) into main (a34d285) will decrease coverage by 0.56%. The diff coverage is 96.55%.

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@@            Coverage Diff             @@
##             main     #420      +/-   ##
==========================================
- Coverage   77.27%   76.72%   -0.56%     
==========================================
  Files         178      178              
  Lines        6514     6526      +12     
==========================================
- Hits         5034     5007      -27     
- Misses       1480     1519      +39     

Impacted Files	Coverage Δ
Sources/TestUtilities/XCTestCase+Publisher.swift	27.77% <93.75%> (-69.60%)	:arrow_down:
...QuranTextKit/Reading/ReadingResourcesService.swift	89.28% <100.00%> (+0.39%)	:arrow_up:
...ranTextKitTests/ReadingResourcesServiceTests.swift	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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