Remove per file scan timeout

[z4kn4fein]

Describe the purpose of your pull request

Upon scanning, each file reading task had a timeout set (1 min). With too many tasks running parallel, while a task's timeout counter started ticking, its execution remained in a suspended state. Eventually, it was cancelled due to the timeout, even if it was supposed to work on a fairly small file, so nothing really justified the timeout.

Now, only the whole scanning process has a timeout (30 min), and the /file timeouts were removed.

Requirement checklist (only if applicable)

• I have covered the applied changes with automated tests.
• I have executed the full automated test set against my changes.
• I have validated my changes against all supported platform versions.
• I have read and accepted the contribution agreement.