Fix edge case when the version is a pre-release

What does this MR do and why?

Contributes to #452171 (closed)

Problem

Previous changes #441804 (closed) to Changelog API logic introduced a bug to the version detection.

Before we allowed to provide any valid semantic version as a version value. But now it rejects versions with pre-release identifier.

Solution

Fix the bug and permit versions with a pre-release as a version argument.

MR acceptance checklist

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Before	After

How to set up and validate locally

1. Enable feature flag update_changelog_logic: Feature.enable(:update_changelog_logic)
2. Visit http://gdk.test:3000/api/v4/projects/3/repository/changelog?version=15.1.1-rc1
3. It should return some data instead of an error message