Use TTLCache for _BACKENDS_CACHE (#3389) #6011

Job	Run time
compute-version	4s
build-docs / build-docs	1m 19s
build-artifacts / gateway-build	14s
build-artifacts / frontend-build	7s
build-artifacts / code-lint	45s
build-artifacts / runner-test (ubuntu-latest)	57s
build-artifacts / runner-test (macos-latest)	1m 8s
build-artifacts / generate-json-schema	21s
build-artifacts / python-build	19s
build-artifacts / python-test (macos-latest, 3.12)	3m 5s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 45s
build-artifacts / python-test (macos-latest, 3.9)	2m 24s
build-artifacts / python-test (windows-latest, 3.13)	2m 11s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 25s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 35s
build-artifacts / python-test (windows-latest, 3.9)	1m 58s
build-artifacts / python-test (windows-latest, 3.11)	2m 6s
build-artifacts / python-test (macos-latest, 3.10)	2m 10s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 35s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 36s
build-artifacts / python-test (windows-latest, 3.12)	2m 9s
build-artifacts / python-test (windows-latest, 3.10)	1m 44s
build-artifacts / python-test (macos-latest, 3.11)	3m 18s
build-artifacts / python-test (macos-latest, 3.13)	3m 33s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	33s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	33s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	22s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	16s
	54m 32s

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