Refactor Inetum scraper to streamline pagination and improve job data extraction

[lalalaurentiu]

This pull request refactors the job scraping logic for the Inetum site to improve pagination handling and ensure proper HTTP headers are set for requests. The changes replace a static pagination approach with a dynamic loop and set a custom user-agent header to improve scraping reliability.

Scraper improvements:

• Added a custom User-Agent header to all HTTP requests to mimic a real browser and reduce the risk of being blocked by the target site (sites/inetum.py).
• Refactored pagination logic to use a while loop that fetches jobs page by page until no more jobs are found, instead of relying on a precomputed number of pages (sites/inetum.py). [1] [2]

Code cleanup:

• Removed unused imports and variables, such as json, ceil, and totalJobs, to simplify the code (sites/inetum.py).