Fix errors with map resources being not found in 2.6.

[asvitkine]

Change Summary & Additional Notes

Fix errors with map resources being not found in 2.6.

This was caused by some maps having duplicate files (e.g. a polygon.txt file in baseTiles folder). Before this change, it's undefined which of these files will be found first and all other files will be expected to be alongside it.

With this change, the search returns files in a deterministic order, sorted by path length. So files closer to the root will be first in the list. This makes the behavior deterministic across platforms and the map to use the file closest to the map root.

Tested:
Loading WW2 Oil and Snow on Windows, both starting the game and viewing the images in the game notes. Without this change, that map exhibited #10417.

Release Note

[codecov]

Codecov Report

Merging #10504 (49fbc3a) into master (0333b85) will increase coverage by 0.00%.
The diff coverage is 80.00%.

@@            Coverage Diff            @@
##             master   #10504   +/-   ##
=========================================
  Coverage     27.86%   27.87%           
- Complexity     7972     7973    +1     
=========================================
  Files          1202     1202           
  Lines         77911    77912    +1     
  Branches      10610    10610           
=========================================
+ Hits          21713    21715    +2     
+ Misses        54212    54209    -3     
- Partials       1986     1988    +2     

Impacted Files	Coverage Δ
...framework/map/file/system/loader/InstalledMap.java	16.32% <0.00%> (ø)
...iplea/map/description/file/MapDescriptionYaml.java	63.88% <100.00%> (ø)
...map/description/file/MapDescriptionYamlReader.java	92.30% <100.00%> (ø)
...extras/src/main/java/org/triplea/io/FileUtils.java	40.32% <100.00%> (+6.17%)	⬆️
...rc/main/java/games/strategy/net/nio/NioReader.java	82.50% <0.00%> (-3.75%)	⬇️
.../main/java/games/strategy/net/ClientMessenger.java	62.50% <0.00%> (-2.09%)	⬇️
...ea/http/client/web/socket/WebSocketConnection.java	64.94% <0.00%> (-1.04%)	⬇️

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