Use TTLCache for _BACKENDS_CACHE #6008

Job	Run time
compute-version	2s
build-docs / build-docs	1m 13s
build-artifacts / gateway-build	10s
build-artifacts / code-lint	40s
build-artifacts / frontend-build	10s
build-artifacts / runner-test (macos-latest)	1m 0s
build-artifacts / runner-test (ubuntu-latest)	54s
build-artifacts / generate-json-schema	22s
build-artifacts / python-build	25s
build-artifacts / python-test (macos-latest, 3.11)	3m 9s
build-artifacts / python-test (windows-latest, 3.10)	1m 59s
build-artifacts / python-test (macos-latest, 3.10)	3m 25s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 53s
build-artifacts / python-test (windows-latest, 3.9)	1m 53s
build-artifacts / python-test (macos-latest, 3.12)	3m 2s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 34s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 48s
build-artifacts / python-test (macos-latest, 3.9)	2m 16s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 36s
build-artifacts / python-test (windows-latest, 3.13)	2m 28s
build-artifacts / python-test (windows-latest, 3.12)	2m 33s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 40s
build-artifacts / python-test (windows-latest, 3.11)	2m 1s
build-artifacts / python-test (macos-latest, 3.13)	3m 17s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	32s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	32s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	20s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	18s
	56m 12s

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