Adding handling for namespace repo defaults

[djpugh]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Have you updated the appropriate files

Please check that you have (if appropriate):

• Updated the documentation
• Updated README.md
• Executed pre-commit run --all-files with no errors
• The change is fully covered by automated unit tests

What is the current behavior?

Currently cannot easily set/enforce namespace validation from the environment variables (e.g. if repo created)

What is the new behavior?

• Added namespace validation handling to codebase initialisation
• Added default behaviour (if unset, but folder exists in codebase folder then use it)
• Added environment variable handling (e.g. Enum as str not int so can parse)

Other information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.00%. Comparing base (1b24141) to head (4db5af6).
Report is 4 commits behind head on main.

❗ Current head 4db5af6 differs from pull request most recent head 4b48cbc. Consider uploading reports for the commit 4b48cbc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
+ Coverage   78.42%   79.00%   +0.58%     
==========================================
  Files          53       53              
  Lines        1738     1748      +10     
==========================================
+ Hits         1363     1381      +18     
+ Misses        375      367       -8     

Flag	Coverage Δ
tests	79.00% <100.00%> (+0.58%)	⬆️

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud