backport-v1.2: refactor: use POST method based API to fetch span details from Observer

[nilushancosta]

Purpose

Backport the changes in #762 to release-v1.2

Approach

Cherry picked commit 2be6137
For the approach used for the implementation, please refer the original PR

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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