Increase coverage on otel/app/defaultconfig and otel/app/defaultcomponents

[joe-elliott]

Which problem is this PR solving?

• Increasing coverage for Run coverage for OTEL module too #2514

Short description of the changes

• Added the ability to test the factory returned by CreateDefaultConfig()
• Added the ability to test otelconfigs
• Refactored Merge() to remove an untested line
• Increased coverage on defaultscomponents/defaults

jaeger/cmd/opentelemetry/app/defaultconfig (master)$ go test -cover
PASS
coverage: 81.9% of statements
ok  	github.com/jaegertracing/jaeger/cmd/opentelemetry/app/defaultconfig	0.153s

jaeger/cmd/opentelemetry/app/defaultconfig (otel-coverage)$ go test -cover
PASS
coverage: 98.8% of statements

jaeger/cmd/opentelemetry/app/defaultcomponents (master)$ go test -cover
PASS
coverage: 84.6% of statements

jaeger/cmd/opentelemetry/app/defaultcomponents (otel-coverage)$ go test -cover
PASS
coverage: 100.0% of statements

[codecov]

Codecov Report

Merging #2515 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2515      +/-   ##
==========================================
+ Coverage   95.38%   95.41%   +0.02%     
==========================================
  Files         208      208              
  Lines        9219     9219              
==========================================
+ Hits         8794     8796       +2     
+ Misses        349      348       -1     
+ Partials       76       75       -1     

Impacted Files	Coverage Δ
...lugin/sampling/strategystore/adaptive/processor.go	99.07% <0.00%> (-0.93%)	⬇️
plugin/storage/badger/spanstore/reader.go	96.04% <0.00%> (ø)
cmd/query/app/server.go	90.16% <0.00%> (+1.63%)	⬆️
cmd/query/app/static_handler.go	84.40% <0.00%> (+1.83%)	⬆️

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[pavolloffay]

hmm qretry should not be there.

[joe-elliott]

queued_retry is in here b/c of the missing testdata/addqueuedprocessor.yaml. See my recent push.

[pavolloffay]

The modified test panics when running locally.

[joe-elliott]

The modified test panics when running locally.

Apologies. I forgot the config file you noticed above. It's now been pushed and I believe tests should pass.