feat: enhance file upload functionality to support multiple GTmetrix file types and improve data handling

feat: implement file upload handling for PDF and CSV formats in uploadFile class

fix: remove error messages for invalid PDF and CSV files in upload_File.py

chore: add blank lines for improved readability in upload_File.py

feat: add error handling for invalid PDF files during upload

refactor: integrate hide_button for improved error handling in file upload

refactor: update analyst page navigation and import structure; add file upload functionality