chore(jans-cedarling): ensure human-readability of tests and fixtures

[djellemah]

Description

Cedar policies and schemas, tokens, and cedarling policy store json all need to be human-readable as far as possible.

This is to ensure that tests making use of those artifacts can be validated.

• Development target issue

  No specific feature request or bug id.

• Implementation Details

  Look at existing tests and test fixtures to find those that are not human readable. Take into account development ergonomics, and needs of project management.

  Establish whether tests can realistically be modified to address human readability.

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Prepare

• Read contribution guidelines
• Read license information

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Identified code changes

• PR merged

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Test cases and code coverage

• Write unit test to cover added/changed code - moved to sub-issue
• Update integration tests to cover added/changed code - moved to sub-issue

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Document the changes

• task for updating developer documentation - moved to sub-issue
• task for updating technical documentation - moved to sub-issue