Fix timeouts not being applied

[sunkup]

Purpose

Timeouts were not being applied correctly / at all.

Short description

• use ktor plugin to apply the timeouts
• don't set timeout for okhttp directly

https://ktor.io/docs/client-timeout.html

Checklist

• The PR has a proper title, description and label.
• I have self-reviewed the PR.
• I have added documentation to complex functions and functions that can be used by other modules.
• I have added reasonable tests or consciously decided to not add tests.

[Copilot]

Pull Request Overview

This PR fixes timeout configuration by moving from OkHttp-specific timeout settings to Ktor's built-in timeout plugin, ensuring timeouts are properly applied across all HTTP client engines.

• Replaced OkHttp-specific timeout configuration with Ktor's HttpTimeout plugin
• Removed direct timeout settings from OkHttp engine configuration
• Added proper timeout values for connect (20s), request (60s), and socket (60s) operations

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[ArnyminerZ]

Looks good. I'd use this opportunity to also get rid of the followRedirects option in the engine, and close #686