Fix: preprocessing related fields removed from PATCH endpoint

[dkaushik94]

Removing pre-processing related fields from being updated through the PATCH endpoint since they should be immutable once created.

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[github-actions]

✅ Migration Validation Passed

All migrations follow the Expand-Contract pattern correctly.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.73%. Comparing base (5f1463f) to head (e13d00f).

Additional details and impacted files

@@                Coverage Diff                 @@
##           release-1.10.0   #13112      +/-   ##
==================================================
+ Coverage           54.72%   54.73%   +0.01%     
==================================================
  Files                2145     2145              
  Lines              200205   200199       -6     
  Branches            28489    28490       +1     
==================================================
+ Hits               109562   109586      +24     
+ Misses              89461    89431      -30     
  Partials             1182     1182              

Flag	Coverage Δ
backend	59.90% <100.00%> (-0.11%)	⬇️
frontend	54.76% <ø> (+0.04%)	⬆️
lfx	49.30% <ø> (ø)

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Files with missing lines	Coverage Δ
src/backend/base/langflow/api/v1/memories.py	86.61% <100.00%> (ø)
...flow/services/database/models/memory_base/model.py	97.75% <ø> (-0.10%)	⬇️
...kend/base/langflow/services/memory_base/service.py	59.85% <100.00%> (+0.83%)	⬆️

... and 48 files with indirect coverage changes

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	38.4% (47871/124659)	67.9% (6542/9634)	38.28% (1100/2873)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
4302	0 💤	0 ❌	0 🔥	10m 47s ⏱️