[Trufflehog Update] Add Trufflehog secret scanning workflow

[matbmoser]

Description

The GitGuardian secret scanning tool licence is now expired, therefore in order to maintain the Security of the Tractus-X Repositories there will be inforced the TRG-8.03 for all Tractus-X repos.

Main ticket

eclipse-tractusx/sig-security#86

What needs to be done?

• Add the Trufflehog workflow like described in TRG-8.03 to the /.github/workflows folder
• Remove all references to GitGuardian from documentation
• Create a PR and Merge it to main
• As committer: revise if any secrets were found in the scan (in security tab)
• Close this ticket

Thank you very much for doing the update! 🚀
If there is any question, please let us know,

Your Tractus-X Project Leads 💯