Revert "Add public API event for kernel post-initialization (#16214)" #17521

Job	Run time
Build VSIX	1m 15s
cancel_previous_runs	2s
Lint	1m 54s
Type Script Tests (ubuntu-latest, ts-unit)	1m 21s
Type Script Tests (windows-latest, ts-unit)	5m 29s
Tests (raw, python, 3.10, ^[^@]+$\|@mandatory\|@kernelCore\|@python\|@jupyter, ubuntu-latest)	5m 43s
Tests (raw, python, 3.10, @widgets, ubuntu-latest)	4m 22s
Tests (raw, python, 3.10, @iw, ubuntu-latest)	3m 57s
Tests (raw, python, 3.10, @webview\|@export\|@lsp\|@variableViewer, ubuntu-latest)	4m 25s
Tests (raw, python, 3.10, @debugger, ubuntu-latest)	3m 20s
Tests (remote, python, 3.10, ^[^@]+$\|@mandatory, ubuntu-latest)	3m 39s
Tests (web, python, 3.10, ^[^@]+$\|@mandatory, ubuntu-latest)	2m 45s
Tests (raw, python, 3.10, ^[^@]+$\|@mandatory, windows-latest)	6m 41s
Tests (raw, python, 3.10, @widgets, ubuntu-latest, 8)	4m 25s
Tests (remote, python, 3.10, @widgets, ubuntu-latest, 8)	5m 23s
Tests (raw, conda, 3.10, ^[^@]+$\|@mandatory\|@python, ubuntu-latest)	3m 30s
Tests (raw, noPython, @nonPython, ubuntu-latest)	1m 36s
Tests (remote, python, 3.10, @kernelCore, ubuntu-latest)	3m 59s
Smoke tests (ubuntu-latest, 3.10)	1m 29s
Smoke tests (windows-latest, 3.10)	4m 36s
Smoke tests (macos-latest, 3.10)	1m 41s
	1h 11m 32s

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