Update Jaeger exporter convenience functions

[MrAlias]

Replace the flush function returned from the Jaeger exporter's convenience creation functions (InstallNewPipeline and NewExportPipeline) with the TracerProvider implementation they create. This enables the caller to shutdown and flushing of the using the related TracerProvider methods.

Additionally this updates the associated unit tests for these functions to test their functionality directly instead of testing functional options of the trace API's TracerProvider.

Resolves #1725
Resolves #1327
Part of #1799

[codecov]

Codecov Report

Merging #1822 (cc97540) into main (1b9f16d) will decrease coverage by 0.2%.
The diff coverage is 60.0%.

@@           Coverage Diff           @@
##            main   #1822     +/-   ##
=======================================
- Coverage   78.3%   78.1%   -0.3%     
=======================================
  Files        135     135             
  Lines       7245    7245             
=======================================
- Hits        5680    5665     -15     
- Misses      1315    1331     +16     
+ Partials     250     249      -1     

Impacted Files	Coverage Δ
exporters/trace/jaeger/jaeger.go	88.7% <60.0%> (-2.3%)	⬇️
exporters/trace/jaeger/uploader.go	36.9% <0.0%> (-12.4%)	⬇️
sdk/trace/batch_span_processor.go	82.4% <0.0%> (-1.6%)	⬇️