Naming improvements in chat endpoint

[lferran]

Description

Essentially renaming context to chat_history to better reflect what the parameter is about

How was this PR tested?

Describe how you tested this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c83ed77) 81.14% compared to head (a1642b7) 81.14%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1627   +/-   ##
=======================================
  Coverage   81.14%   81.14%           
=======================================
  Files         321      321           
  Lines       19062    19058    -4     
=======================================
- Hits        15468    15465    -3     
+ Misses       3594     3593    -1     

Flag	Coverage Δ
ingest	69.18% <ø> (ø)
utils	80.55% <ø> (ø)
writer	85.35% <ø> (ø)

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