chore: enable incremental builds

[dyladan]

Which problem is this PR solving?

• Enable incremental builds #632

Short description of the changes

• Enable the incremental: true flag

[codecov-io]

Codecov Report

Merging #633 into master will decrease coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #633      +/-   ##
==========================================
- Coverage   90.68%   90.49%   -0.19%     
==========================================
  Files         181      181              
  Lines        9371     9249     -122     
  Branches      817      812       -5     
==========================================
- Hits         8498     8370     -128     
- Misses        873      879       +6

Impacted Files	Coverage Δ
...kages/opentelemetry-metrics/test/mocks/Exporter.ts	66.66% <0%> (-33.34%)	⬇️
...ages/opentelemetry-plugin-http/test/utils/utils.ts	33.33% <0%> (-26.67%)	⬇️
.../opentelemetry-exporter-collector/src/transform.ts	88.88% <0%> (-8.09%)	⬇️
...entelemetry-exporter-jaeger/test/transform.test.ts	100% <0%> (ø)	⬆️
...opentelemetry-base/test/resources/resource.test.ts	100% <0%> (ø)	⬆️
...ges/opentelemetry-exporter-zipkin/src/transform.ts	100% <0%> (ø)	⬆️
...telemetry-plugin-grpc/test/utils/assertionUtils.ts	100% <0%> (ø)	⬆️
.../opentelemetry-plugin-dns/test/utils/assertSpan.ts	100% <0%> (ø)	⬆️
.../opentelemetry-exporter-zipkin/test/zipkin.test.ts	100% <0%> (ø)	⬆️
.../opentelemetry-exporter-jaeger/test/jaeger.test.ts	100% <0%> (ø)	⬆️
... and 9 more

[OlivierAlbertini]

Nice!