Ensure checksum errors result in error

[briandealwis]

Maven's default checksumPolicy appears to be warn. This patch sets the checksum policy in our DependencyResolver to fail.

Unfortunately I can't figure out how to inject a RepositoryConnector or Transporter (or one of their providers or factories) to try to inject a transfer failure to test, but I did verify with a breakpoint that the checksum policy was set to error.

[codecov]

Codecov Report

Merging #2887 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #2887      +/-   ##
============================================
+ Coverage     68.86%   68.92%   +0.06%     
- Complexity     2587     2591       +4     
============================================
  Files           353      353              
  Lines         12369    12371       +2     
  Branches       1468     1468              
============================================
+ Hits           8518     8527       +9     
+ Misses         3244     3241       -3     
+ Partials        607      603       -4

Impacted Files	Coverage Δ	Complexity Δ
...e/cloud/tools/eclipse/util/DependencyResolver.java	96.77% <100%> (+0.22%)	2 <0> (ø)	⬇️
...ow/ui/preferences/RunOptionsDefaultsComponent.java	77.81% <0%> (+1.45%)	44% <0%> (+3%)	⬆️
...ibraries/LibraryClasspathContainerResolverJob.java	100% <0%> (+25%)	4% <0%> (+1%)	⬆️

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