[EXPORTER] All 2xx return codes should be considered successful.

[owent]

Fixes #2632

Changes

According to https://datatracker.ietf.org/doc/html/rfc7231#page-47 . All 2xx return codes should be considered successful.

For significant contributions please make sure you have completed the following items:

• [ ] CHANGELOG.md updated for non-trivial changes
• [x] Unit tests have been added
• [x] Changes in public API reviewed