refactor(otlp-exporter-base): remove exports that were meant to be internal

[pichlermarc]

Which problem is this PR solving?

Note

these exports are not published yet and were introduced in #5031, so this still counts as a refactor if it is merged before the changes from #5031 are released. 🙂

In #5031 I introduced a few new types and functions, and two of these functions don't really need to be exported:

• createOtlpExportDelegate
• createBoundedQueueExportPromiseHandler

This PR removes these exports.

How Has This Been Tested?

• Unit tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.59%. Comparing base (5ad0aa5) to head (5e4bbdc).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5212      +/-   ##
==========================================
+ Coverage   94.58%   94.59%   +0.01%     
==========================================
  Files         314      314              
  Lines        7993     7993              
  Branches     1611     1611              
==========================================
+ Hits         7560     7561       +1     
+ Misses        433      432       -1     

see 1 file with indirect coverage changes