FIX:: Generate correct ISO 8601 timestamps in UTC for alerting

[frikilax]

✨ FIX:: Generate correct ISO 8601 timestamps in UTC for alerting

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📃 Type of change

Bug fix: non-breaking change which fixes an issue.
Breaking change: fix or feature that would cause existing functionality to not work as expected.

💡 Related Issue(s)

• Resolve [BUG] reformat timestamp from alerts to be valid RFC3339 #166

✒️ Description

Changed GetTime's toolkit function to return valid RFC3339 timestamps, used for alerts generation.
[BREAKING CHANGE] Those timestamps are now always generated as UTC.

🎯 Test Environments

HBSD (12.1)

• g++ (9.3.0)
• CMake (3.17.2)

Ubuntu (18.04)

• g++ (or clang++) (7.5.0)
• CMake (3.10.2)
• Valgrind (3.13.0)

✔️ Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• (If other changes) I have made corresponding changes to the documentation
• New and existing tests pass locally with my changes

• 🙋 I certify on my honor that all the information provided is true, and I've done all I can to deliver a high quality code