feat: create guardrails component (#11451)

[viktoravelino]

• Create guardrails.py

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• [autofix.ci] apply automated fixes (attempt 2/3)

• Update guardrails.py

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• [autofix.ci] apply automated fixes (attempt 2/3)

• tests: add unit tests for GuardrailsComponent functionality

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• fix: resolve linting errors in GuardrailsComponent and tests

• Fix line length issues (E501) by breaking long strings
• Fix docstring formatting (D205, D415) in _check_guardrail
• Use ternary operator for response content extraction (SIM108)
• Replace magic value with named constant (PLR2004)
• Move return to else block per try/except best practices (TRY300)
• Catch specific exceptions instead of blind Exception (BLE001)
• Use list comprehension for checks_to_run (PERF401)
• Mark unused variables with underscore prefix (RUF059, F841)
• Add noqa comment for intentionally unused mock argument (ARG002)

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• refactor: address pr comments

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• [autofix.ci] apply automated fixes

• feat: enhance heuristic detection with configurable threshold and scoring system

• refactor: simplify heuristic test assertions by removing unused variable

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• [autofix.ci] apply automated fixes (attempt 2/3)

• feat: enhance guardrail validation logic and input handling

• refactor: streamline import statements and clean up whitespace in guardrails component

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• [autofix.ci] apply automated fixes (attempt 2/3)

• Fix: update empty input handling tests to raise ValueError and refactor related assertions

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• [autofix.ci] apply automated fixes

• feat: add Guardrails component with unit tests

Add LLM-based guardrails component for detecting PII, tokens/passwords, jailbreak attempts, and custom guardrail rules, along with comprehensive unit tests.

• [autofix.ci] apply automated fixes

• fix: try removing logs

• [autofix.ci] apply automated fixes

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• Commit unit tests in branch feat/guardrails

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	18.39% (5918/32166)	12.03% (3016/25070)	12.36% (855/6917)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
2288	0 💤	0 ❌	0 🔥	31.984s ⏱️

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release-v1.8.0@c057f77). Learn more about missing BASE report.

Additional details and impacted files

@@                Coverage Diff                @@
##             release-v1.8.0   #11671   +/-   ##
=================================================
  Coverage                  ?   35.22%           
=================================================
  Files                     ?     1521           
  Lines                     ?    72936           
  Branches                  ?    10937           
=================================================
  Hits                      ?    25690           
  Misses                    ?    45852           
  Partials                  ?     1394           

Flag	Coverage Δ
backend	55.74% <ø> (?)
frontend	16.65% <ø> (?)
lfx	42.10% <ø> (?)

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