refactor(jetsocat): implement better coloring control for logging

[RRRadicalEdward]

This PR improves coloring control as requested in https://github.com/Devolutions/IronVNC/pull/988#pullrequestreview-3303353388.

[github-actions]

Let maintainers know that an action is required on their side

• Add the label release-required Please cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module) when you request a maintainer to cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module)

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[RRRadicalEdward]

In tests, assert_cmd is used to run jetsocat in a child process, where stderr is piped. This means that we always have is_terminal = false. That's why, for example, log_term_coloring with the default case will return false.