fix(cli): use output_dir when printing Saved to path in monitor

[sohammishra864-wq]

Description

Fix the "Saved to" path printed by codecarbon monitor to include output_dir, not just the bare filename resolved against CWD.

Related Issue

Closes #1322

Motivation and Context

When output_dir is set (via config or env var), the CLI printed <cwd>/emissions.csv instead of <output_dir>/emissions.csv. The actual CSV was written to the correct location by FileOutput, but the user-facing message pointed to the wrong place.

How Has This Been Tested?

• Ran codecarbon monitor with custom output_dir and verified the printed path matches the actual file locatio

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

AI Usage Disclosure

• AI-vibecoded
• AI-generated
• AI-assisted
• No AI used

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have read the docs/how-to/contributing.md document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.70%. Comparing base (3fcd4dc) to head (955b21b).
⚠️ Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
codecarbon/cli/monitor.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1409      +/-   ##
==========================================
+ Coverage   91.68%   91.70%   +0.01%     
==========================================
  Files          49       49              
  Lines        5136     5157      +21     
==========================================
+ Hits         4709     4729      +20     
- Misses        427      428       +1     

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