backport-v1.1: refactor: use POST method based API to fetch span details from Observer

[nilushancosta]

Purpose

Backport the changes in #762 to release-v1.1

Approach

Cherry picked commit 898dbaf
For the approach used for the implementation, please refer the original PR

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[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...enchoreo-observability/src/hooks/useSpanDetails.ts	0.00%	3 Missing ⚠️

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