feat: namespace refactoring

[sliedig]

Issue number:
#63

Summary

Separated namespace definitions. These only need to be defined once per domain/sub-domain and don't need to be replaced across environments like other resources.

Changes

• Separated namespace parameter store definitions into a separate template. This needs to be deployed before any applications
• Added Makefiles for self hosted workshops to deploy and teardown infra for namespaces and images buckets.
• Updated all the templates in the solution to reference "{{resolve:ssm:/uni-prop/UnicornContractsNamespace}}" instead of Fn::Sub: "{{resolve:ssm:/uni-prop/${Stage}/UnicornContractsNamespace}}"
• Updated nest template definitions with explicit Update/Delete policies
• Minor fixes and spelling corrections

User experience

Simplified management and referencing of namespace parameters

Checklist

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• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

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