Add missing integration test for filter ordering

[MartinWheelerMT]

What

• Add default values for missing required environment variable in application.yml for the integration tests.
• Add missing integration test for filter ordering.

Why

The current way the filters work is unclear and ungainly. In order to complete some refactoring work on the filters and how they are loaded requires that test are in place to ensure the loading and ordering of the filters is completed correctly.

Type of Change

Please check the option(s) that apply.

• Internal change (non-breaking change with no effect on functionality affecting end users)

Checklist

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have updated the Changelog with details of my change in the UNRELEASED section, if this change will affect end users

[github-actions]

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