chore: fixing a list of files to be in unit test coverage report

[obecny]

Which problem is this PR solving?

• the list of files for coverage report should be only a src code not unit tests itself, as well as files which are configurations should be also skipped

[codecov]

Codecov Report

Merging #1091 into master will decrease coverage by 2.63%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1091      +/-   ##
==========================================
- Coverage   94.98%   92.34%   -2.64%     
==========================================
  Files         238      115     -123     
  Lines        9085     3398    -5687     
  Branches      822      684     -138     
==========================================
- Hits         8629     3138    -5491     
+ Misses        456      260     -196     

Impacted Files	Coverage Δ
...ges/opentelemetry-exporter-zipkin/test/e2e.test.ts
packages/opentelemetry-metrics/test/Meter.test.ts
...s/opentelemetry-shim-opentracing/test/Shim.test.ts
...s/opentelemetry-context-zone-peer-dep/.eslintrc.js
...ckages/opentelemetry-core/test/platform/id.test.ts
packages/opentelemetry-plugin-http/.eslintrc.js
...ntelemetry-node/test/instrumentation/utils.test.ts
packages/opentelemetry-api/test/api/api.test.ts
...ages/opentelemetry-plugin-http/test/utils/utils.ts
...y-tracing/test/export/InMemorySpanExporter.test.ts
... and 113 more