blueprints: Add support for generating flat and unique sequences in blueprint enumeration tags

[astro-stan]

Details

I would like to be able to generate flattened and possibly unique sequences during blueprint templating.

The specific use case I have is something like this:

...
context:
  authentication.backends: # Used for all password stages
    - authentik.core.auth.InbuiltBackend
entries:
 ...
  - model: authentik_stages_password.passwordstage
    identifiers:
      name:  ldap-password-stage
    attrs:
      backends:
       - !Enumerate
         - !Enumerate 
           # Use all configured backends as for the other password stages but ensure the token backend is included too
           - [!Context authentication.backends, authentik.core.auth.TokenBackend]
           - FLAT_SEQ
           - !Value 0
         - UNIQ_SEQ
         - !Value 0

---

Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make docs)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.00%. Comparing base (949d1ea) to head (8563353).
✅ All tests successful. No failed tests found.

❗ There is a different number of reports uploaded between BASE (949d1ea) and HEAD (8563353). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (949d1ea)	HEAD (8563353)
unit	10	8
unit-migrate	10	8

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20785      +/-   ##
==========================================
- Coverage   93.45%   84.00%   -9.45%     
==========================================
  Files         993      993              
  Lines       55968    55969       +1     
==========================================
- Hits        52305    47019    -5286     
- Misses       3663     8950    +5287     

Flag	Coverage Δ
conformance	37.54% <33.33%> (+<0.01%)	⬆️
e2e	43.06% <33.33%> (+<0.01%)	⬆️
integration	22.24% <33.33%> (-0.05%)	⬇️
unit	81.52% <33.33%> (-10.10%)	⬇️
unit-migrate	81.89% <100.00%> (-9.82%)	⬇️

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[astro-stan]

Remaining errors on CI seem unrelated as far as I can tell. I get the same errors when I apply the tags.yaml blueprint on main.