Update build/jacoco for new bundles & tests

[briandealwis]

• add com.google.cloud.tools.eclipse.googleapis and com.google.cloud.tools.eclipse.appengine.flex
• tweak README.md to add note about including new bundles and fragments in build/jacoco

[codecov-io]

Codecov Report

Merging #1597 into master will increase coverage by 0.48%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1597      +/-   ##
============================================
+ Coverage      71.1%   71.58%   +0.48%     
- Complexity     1338     1382      +44     
============================================
  Files           238      244       +6     
  Lines          9074     9214     +140     
  Branches        780      790      +10     
============================================
+ Hits           6452     6596     +144     
+ Misses         2297     2290       -7     
- Partials        325      328       +3

Impacted Files	Coverage Δ	Complexity Δ
...clipse/appengine/facets/NonSystemJobSuspender.java	83.78% <0%> (-5.41%)	9% <0%> (-1%)
...ools/eclipse/googleapis/internal/GoogleApiUrl.java	87.5% <0%> (ø)	3% <0%> (?)
.../eclipse/googleapis/internal/GoogleApiFactory.java	96% <0%> (ø)	10% <0%> (?)
...ools/eclipse/googleapis/internal/ProxyFactory.java	94.44% <0%> (ø)	9% <0%> (?)
...d/tools/eclipse/googleapis/GoogleApiException.java	100% <0%> (ø)	1% <0%> (?)
...ipse/googleapis/internal/TransportCacheLoader.java	100% <0%> (ø)	2% <0%> (?)
...leapis/internal/TimeoutAwareConnectionFactory.java	100% <0%> (ø)	4% <0%> (?)
.../eclipse/test/util/project/TestProjectCreator.java	93.57% <0%> (+2.53%)	25% <0%> (+10%)	✅
.../tools/eclipse/test/util/project/ProjectUtils.java	92.45% <0%> (+5.66%)	27% <0%> (+3%)	✅
...pse/appengine/validation/AbstractXmlValidator.java	96.77% <0%> (+6.45%)	7% <0%> (ø)	❌
... and 3 more

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