fix(tracing): write logs as compact JSONL for filesystem adapter

[Pouyanpi]

Description

Update filesystem tracing adapter to write logs as compact JSONL (no indentation), ensuring each record is a single line. Add and update tests to verify correct JSONL formatting, multiple records, and streaming compatibility.

[Copilot]

Pull Request Overview

This PR updates the filesystem tracing adapter to write logs in compact JSONL format by removing indentation from JSON output, ensuring each record is written as a single line for better compatibility with streaming processors and log analysis tools.

Key changes:

• Remove indent=2 parameter from json.dumps() calls in both sync and async methods
• Add comprehensive tests to verify JSONL format compliance and streaming compatibility

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
nemoguardrails/tracing/adapters/filesystem.py	Updated JSON serialization to remove indentation for compact JSONL output
tests/test_tracing_adapters_filesystem.py	Added three new test methods to verify JSONL formatting and streaming behavior

Comments suppressed due to low confidence (1)

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 70.61%. Comparing base (3018024) to head (9dd4077).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
nemoguardrails/tracing/adapters/filesystem.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1333   +/-   ##
========================================
  Coverage    70.61%   70.61%           
========================================
  Files          161      161           
  Lines        16304    16304           
========================================
  Hits         11513    11513           
  Misses        4791     4791           

Flag	Coverage Δ
python	70.61% <50.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
nemoguardrails/tracing/adapters/filesystem.py	64.70% <50.00%> (ø)

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