Support user prompt param on summarize

[lferran]

Description

Describe the proposed changes made in this PR.

How was this PR tested?

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[shortcut-integration]

This pull request has been linked to Shortcut Story #8592: Suuport user_prompt param on /summarize.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6e0ad01) 82.11% compared to head (d99a4c8) 82.11%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1752   +/-   ##
=======================================
  Coverage   82.11%   82.11%           
=======================================
  Files         336      336           
  Lines       19673    19674    +1     
=======================================
+ Hits        16155    16156    +1     
  Misses       3518     3518           

Flag	Coverage Δ
ingest	69.07% <ø> (ø)
nucliadb	70.21% <100.00%> (+<0.01%)	⬆️
reader	79.05% <ø> (ø)
sdk	40.58% <ø> (ø)
search	79.00% <0.00%> (-0.04%)	⬇️
standalone	88.29% <ø> (ø)
train	63.71% <ø> (ø)
utils	81.42% <ø> (ø)
writer	85.15% <ø> (ø)

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