Semi-automatic update of generated content (#2289)

* Update self-generated content

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Co-authored-by: Create or Update Pull Request Action <create-or-update-pull-request@users.noreply.github.com>

src/content/changes/observability-platform/alloy-app/v0.5.2.md

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+---
+# Generated by scripts/aggregate-changelogs. WARNING: Manual edits to this files will be overwritten.
+changes_categories:
+- Observability Platform
+changes_entry:
+  repository: giantswarm/alloy-app
+  url: https://github.com/giantswarm/alloy-app/blob/master/CHANGELOG.md#052---2024-09-17
+  version: 0.5.2
+  version_tag: v0.5.2
+date: '2024-09-18T06:33:39'
+description: Changelog entry for giantswarm/alloy-app version 0.5.2, published on
+  18 September 2024, 06:33.
+title: alloy-app release v0.5.2
+---
+
+### Added
+- Add helm chart templating test in ci pipeline.
+- Add tests with ats in ci pipeline.
+- Push alloy as a gateway component in collections.

src/content/changes/web-ui/backstage/v0.35.3.md

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+---
+# Generated by scripts/aggregate-changelogs. WARNING: Manual edits to this files will be overwritten.
+changes_categories:
+- Web UI
+changes_entry:
+  repository: giantswarm/backstage
+  url: https://github.com/giantswarm/backstage/blob/master/CHANGELOG.md#0353---2024-09-17
+  version: 0.35.3
+  version_tag: v0.35.3
+date: '2024-09-17T15:11:12'
+description: Changelog entry for giantswarm/backstage version 0.35.3, published on
+  17 September 2024, 15:11.
+title: backstage release v0.35.3
+---
+
+### Changed
+- Update CSP (content security policy) for images.