test

Bump version to v3.1.0 & add release notes #3621

Job	Run time
reusable_docker_tests / docker-test	34m 8s
reusable_tests / clang	2m 7s
reusable_tests / coverage	3m 46s
reusable_tests / asan	3m 33s
reusable_tests / flaky	1m 49s
reusable_tests / python-linter	15s
reusable_tests / docs	58s
reusable_tests / multiplatform-tests (Release, ubuntu-22.04)	3m 21s
reusable_tests / multiplatform-tests (Release, ubuntu-24.04)	4m 2s
reusable_tests / tsan	3m 51s
reusable_tests / multiplatform-tests (Release, windows-2019)	9m 32s
reusable_tests / uncrustify	40s
reusable_tests / multiplatform-tests (Release, windows-2022)	12m 2s
reusable_tests / multiplatform-tests (Debug, ubuntu-22.04)	3m 28s
reusable_tests / multiplatform-tests (Debug, ubuntu-24.04)	3m 24s
reusable_tests / multiplatform-tests (Debug, windows-2019)	11m 40s
reusable_tests / multiplatform-tests (Debug, windows-2022)	13m 10s
	1h 51m 46s

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