Change OpenCensus receiver to the new interfaces

[bogdandrutu]

No description provided.

[codecov]

Codecov Report

Merging #1556 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1556      +/-   ##
==========================================
+ Coverage   91.46%   91.47%   +0.01%     
==========================================
  Files         250      250              
  Lines       17315    17319       +4     
==========================================
+ Hits        15837    15843       +6     
+ Misses       1063     1062       -1     
+ Partials      415      414       -1     

Impacted Files	Coverage Δ
receiver/opencensusreceiver/opencensus.go	90.09% <ø> (ø)
receiver/opencensusreceiver/factory.go	95.45% <100.00%> (+0.45%)	⬆️
...eceiver/opencensusreceiver/ocmetrics/opencensus.go	90.47% <100.00%> (ø)
receiver/opencensusreceiver/octrace/opencensus.go	83.33% <100.00%> (ø)
service/defaultcomponents/defaults.go	84.90% <100.00%> (ø)
receiver/otlpreceiver/otlp.go	91.66% <0.00%> (-2.78%)	⬇️
translator/internaldata/resource_to_oc.go	83.33% <0.00%> (+4.16%)	⬆️

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[tigrannajaryan]

LGTM.
Do we have any old trace consumers remaining in the codebase or everything is now converted?

[bogdandrutu]

@tigrannajaryan last one is the oc exporter, which I will do after #1516