feat: add flow internal context into webhook context

[splaunov]

This PR adds data from `flow.internal_context' field into the context of Jsonnet mapper. So this data could be used in webhook calls.

Related issue(s)

Checklist

• [ x] I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• [ x] I am following the
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Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.01%. Comparing base (d01b670) to head (07b59ed).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3840      +/-   ##
==========================================
+ Coverage   77.98%   78.01%   +0.03%     
==========================================
  Files         359      359              
  Lines       25190    25191       +1     
==========================================
+ Hits        19644    19653       +9     
+ Misses       4039     4032       -7     
+ Partials     1507     1506       -1     

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[aeneasr]

Isn't the internal context already available in the flow object itself? Or is it hidden in there?

[splaunov]

Yes, it's part of the flow object, but it does not serialise into json:

kratos/selfservice/flow/login/flow.go

Line 86 in 43e4ead

InternalContext sqlxx.JSONRawMessage `db:"internal_context" json:"-" faker:"-"`