fix(expert): content ingestion after sso/mfa auth

[cstns]

Description

slight refactor of context ingestion on the flowfuse side to allow proper context ingestion independently of the auth method used: sso, mfa, email/pass

Related Issue(s)

closes #6274

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production
• Link to Changelog Entry PR, or note why one is not needed.

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.77%. Comparing base (2ffc036) to head (e4687df).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6296   +/-   ##
=======================================
  Coverage   76.77%   76.77%           
=======================================
  Files         386      386           
  Lines       19527    19527           
  Branches     4694     4694           
=======================================
  Hits        14992    14992           
  Misses       4535     4535           

Flag	Coverage Δ
backend	76.77% <ø> (ø)

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