Issue 982 removed topicName field from Message

[videnkz]

Checklist

closes #982

• Implement code
• Add tests
• Update CHANGELOG.asciidoc

[codecov-io]

Codecov Report

Merging #993 into master will increase coverage by 4.79%.
The diff coverage is 66.66%.

@@ Coverage Diff @@ ## master #993 +/- ## ============================================ + Coverage 63.63% 68.43% +4.79%  - Complexity 85 2153 +2068  ============================================ Files 255 219 -36 Lines 10482 9259 -1223 Branches 1391 1191 -200 ============================================ - Hits 6670 6336 -334  + Misses 3402 2537 -865  + Partials 410 386 -24

Impacted Files	Coverage Δ	Complexity Δ
...ic/apm/agent/jms/JmsInstrumentationHelperImpl.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...ava/co/elastic/apm/agent/impl/context/Message.java	96.42% <0%> (-0.55%)	14 <2> (+14)
.../apm/agent/report/serialize/DslJsonSerializer.java	90.57% <100%> (-0.06%)	180 <0> (+180)
...ntracing/impl/ElasticApmTracerInstrumentation.java
...h/src/main/java/co/elastic/apm/attach/JvmInfo.java
...agent/process/CommonsExecAsyncInstrumentation.java
.../main/java/co/elastic/apm/opentracing/ApmSpan.java
...a/co/elastic/apm/opentracing/ElasticApmTracer.java
...Mule4OverrideClassLoaderLookupInstrumentation.java
...tracing/impl/OpenTracingBridgeInstrumentation.java
... and 36 more

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[eyalkoren]

@kananindzya that's awesome, thanks!!
Just please update CHANGELOG.asciidoc

[videnkz]

@kananindzya that's awesome, thanks!!
Just please update CHANGELOG.asciidoc

updated