Add pytest-deltatest to Speed section

[aliowka-kartowka]

This PR adds pytest-deltatest, a fast test selection plugin for pytest using SQLite-based coverage mappings, to the Speed category.

Summary by Sourcery

Documentation:

• Document pytest-deltatest in the Speed section as a fast, change-based pytest test selection plugin.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds pytest-deltatest to the Speed section of the README’s testing tools list, describing it as a fast, coverage-based test selection plugin optimized for local workflows.

File-Level Changes

Change	Details	Files
Document pytest-deltatest as an additional speed-focused pytest plugin in the README Speed section.	Append a new bullet under the Speed category describing pytest-deltatest. Link to the pytest-deltatest GitHub repository. Summarize its functionality as running only tests affected by code changes using SQLite-based coverage mappings optimized for pre-commit usage.	README.md

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PR only contains documentation changes (1 files)

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[aliowka-kartowka]

@cleder Thank you sir 👍