Change deduplicate_releases default to enabled

[kkaarreell]

Summary by Sourcery

Enable release deduplication by default and update tests to reflect the new default behavior.

Enhancements:

• Change settings so Errata Tool release deduplication is enabled by default via both code and configuration parsing.

Tests:

• Update CLI tests to assert that deduplication now occurs by default when no config or flag is provided.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR changes the default behavior of release deduplication from disabled to enabled, updates configuration defaults accordingly, and adjusts the CLI test to validate the new default behavior.

File-Level Changes

Change	Details	Files
Enable deduplication of releases by default across settings and configuration handling.	Change the Settings model default for release deduplication from False to True. Update configuration parsing to default the NEWA_ET_DEDUPLICATE_RELEASES value to '1' when not explicitly set.	newa/models/settings.py
Update CLI tests to reflect that deduplication now occurs by default when no config or flag is provided.	Rename and reword the test case to describe deduplication being enabled by default. Adjust the assertion to expect a single deduplicated event file instead of two separate files.	tests/unit/test_cli.py

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[tcornell-bus]

LGTM