refactor(utils): use shared http_client for requests

[mkoura]

Replaces direct usage of the requests library with the shared http_client session in dbsync_snapshot_service and smash_utils. This improves consistency and enables centralized configuration for HTTP requests.

[Copilot]

Pull request overview

This PR refactors HTTP request handling to use a shared HTTP client session instead of direct requests library calls. This improves consistency across the codebase and enables centralized HTTP configuration.

• Replaced requests.get() calls with http_client.get_session().get() in two utility modules
• Removed unnecessary requests import in dbsync_snapshot_service.py
• Maintained all existing request parameters and authentication mechanisms

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
cardano_node_tests/utils/smash_utils.py	Updated get_retired_pools() method to use shared HTTP client session, consistent with other methods in the class
cardano_node_tests/utils/dbsync_snapshot_service.py	Replaced direct requests import and usage with shared http_client module in S3 API calls

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