Drop `DSTACK_FF_EVENTS` #5976

Job	Run time
compute-version	3s
build-docs / build-docs	1m 5s
build-artifacts / frontend-build	13s
build-artifacts / runner-test (macos-latest)	42s
build-artifacts / runner-test (ubuntu-latest)	1m 0s
build-artifacts / gateway-build	10s
build-artifacts / code-lint	44s
build-artifacts / generate-json-schema	27s
build-artifacts / python-build	36s
build-artifacts / python-test (windows-latest, 3.9)	1m 44s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 31s
build-artifacts / python-test (macos-latest, 3.12)	2m 43s
build-artifacts / python-test (macos-latest, 3.11)	2m 25s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 17s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 25s
build-artifacts / python-test (macos-latest, 3.13)	3m 37s
build-artifacts / python-test (macos-latest, 3.9)	3m 52s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 39s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 38s
build-artifacts / python-test (macos-latest, 3.10)	3m 0s
build-artifacts / python-test (windows-latest, 3.11)	1m 58s
build-artifacts / python-test (windows-latest, 3.10)	1m 52s
build-artifacts / python-test (windows-latest, 3.12)	2m 4s
build-artifacts / python-test (windows-latest, 3.13)	2m 10s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	31s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	19s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	17s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	19s
	54m 21s

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