fix(pdf): resolve compression error and file overwrite issues

[Abdurrahman-shaikh]

Description of Changes

• What was changed:

  • Modified the file handling logic to avoid overwriting the source PDF while it is being read, which previously led to corrupted output files.
    -Modified the logic where optimizeLevel is 9 and we are chacking for optimizeLevel < 9.

• Why the change was made:

  • The original compression process would stuck when dealing with larger files, failing to meet the specified target size limits.
  • Overwriting the input file during processing was causing warnings and potential file corruption, which could lead to instability and incorrect outputs.

• Any challenges encountered:

Closes #2930

---

Checklist

General

• I have read the Contribution Guidelines
• I have read the Stirling-PDF Developer Guide (if applicable)
• [] I have read the How to add new languages to Stirling-PDF (if applicable)
• I have performed a self-review of my own code
• My changes generate no new warnings

Documentation

• [] I have updated relevant docs on Stirling-PDF's doc repo (if functionality has heavily changed)
• [] I have read the section Add New Translation Tags (for new translation tags only)

UI Changes (if applicable)

• Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR)

Testing (if applicable)

• I have tested my changes locally