Drop `DSTACK_FF_EVENTS` (#3372) #5978

Job	Run time
compute-version	4s
build-docs / build-docs	1m 15s
build-artifacts / code-lint	43s
build-artifacts / frontend-build	8s
build-artifacts / gateway-build	12s
build-artifacts / runner-test (ubuntu-latest)	1m 8s
build-artifacts / runner-test (macos-latest)	39s
build-artifacts / generate-json-schema	18s
build-artifacts / python-build	18s
build-artifacts / python-test (macos-latest, 3.12)	3m 28s
build-artifacts / python-test (macos-latest, 3.9)	2m 29s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 21s
build-artifacts / python-test (macos-latest, 3.10)	3m 14s
build-artifacts / python-test (macos-latest, 3.13)	3m 15s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 43s
build-artifacts / python-test (macos-latest, 3.11)	3m 37s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 42s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 54s
build-artifacts / python-test (windows-latest, 3.9)	1m 51s
build-artifacts / python-test (windows-latest, 3.12)	1m 55s
build-artifacts / python-test (windows-latest, 3.11)	1m 57s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 33s
build-artifacts / python-test (windows-latest, 3.13)	1m 51s
build-artifacts / python-test (windows-latest, 3.10)	1m 53s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	33s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	37s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	14s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	15s
	55m 7s

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