[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.

Incident Ticket

https://github.com/eclipse-tractusx/sig-security/issues/86

Your repository was found in one of our security scans, and it was listed along with other repositories for not contain any of this files:

".github/workflows/trufflehog.yaml"
".github/workflows/trufflehog.yml"
".github/workflows/secrets-scan.yml"

Please read the TRG-8.03 and create the workflow file as soon as posible!

What needs to be done?

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

[adityagajbhiye9]

Requested changes has been been done as per TRG 8.03. https://github.com/eclipse-tractusx/managed-simple-data-exchanger-backend/pull/221