add slack notification #8594

Job	Run time
harvest-test-linux / Linux harvest tests (ubuntu-20.04)	59s
linter-linux / Validate code	58s
linter-linux / Run Linter	1m 15s
build-container / Building containerized agent	8m 29s
linter-macos / Lint tests	1m 47s
linter-windows / Lint tests	7m 51s
harvest-test-macos / MacOS harvest tests (macos-13)	42s
harvest-test-macos / MacOS harvest tests (macos-14)	49s
proxy-tests-linux / Proxy tests	1m 47s
test-build / Test binary compilation for all (linux) platforms:arch	7m 0s
unit-test-linux / Unit tests for databind	44s
unit-test-linux / Unit tests	4m 22s
unit-test-macos / unit tests	4m 30s
unit-test-windows / Windows unit tests	8m 43s
unit-test-linux / Coveralls finish	2s
	49m 58s

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