made telegram commands private

[Der-Henning]

Pull Request Checklist

• [ ] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• [ ] Did you make your Pull Request on the dev branch?
• [ ] Does your submission pass tests? make test
• [ ] Have you lint your code locally prior to submission? make lint
• [ ] Could you build and run the docker images successfully? make images
• [ ] Could you create a running executable? make executable
• [ ] Have you added an explanation of what your changes do and why you'd like to include them?
• [ ] Have you written new tests for your changes, as applicable?
• [ ] Have you successfully ran manual tests with your changes locally?

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 75.00000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 64.86%. Comparing base (da792df) to head (3af0885). Report is 1 commits behind head on main.

:exclamation: Current head 3af0885 differs from pull request most recent head a966bb9. Consider uploading reports for the commit a966bb9 to get more accurate results

Files	Patch %	Lines
tgtg_scanner/notifiers/telegram.py	75.00%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #471 +/- ## ========================================== + Coverage 64.72% 64.86% +0.13% ========================================== Files 26 26 Lines 2251 2277 +26 ========================================== + Hits 1457 1477 +20 - Misses 794 800 +6 ```

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