chore(CI): add slack notifications #3196

Job	Run time
Static_Analysis / SpotBugs	17s
Build (11, corretto) / Build	12m 7s
Build (8, temurin) / Build	8m 25s
Build (17, temurin) / Build	10m 18s
Build (8, corretto) / Build	9m 56s
Build (17, corretto) / Build	5m 53s
Build (11, temurin) / Build	14m 42s
Examples / MigrationExamples	1m 4s
notify	0s
	1h 2m 42s

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