Use TTLCache for _BACKENDS_CACHE #6010

Job	Run time
compute-version	3s
build-docs / build-docs	1m 8s
build-artifacts / code-lint	53s
build-artifacts / runner-test (macos-latest)	1m 23s
build-artifacts / gateway-build	11s
build-artifacts / runner-test (ubuntu-latest)	57s
build-artifacts / frontend-build	9s
build-artifacts / python-build	23s
build-artifacts / generate-json-schema	17s
build-artifacts / python-test (macos-latest, 3.10)	5m 2s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 7s
build-artifacts / python-test (macos-latest, 3.11)	2m 39s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 32s
build-artifacts / python-test (macos-latest, 3.13)	3m 52s
build-artifacts / python-test (macos-latest, 3.9)	2m 30s
build-artifacts / python-test (windows-latest, 3.9)	1m 57s
build-artifacts / python-test (windows-latest, 3.11)	2m 15s
build-artifacts / python-test (macos-latest, 3.12)	3m 57s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 23s
build-artifacts / python-test (ubuntu-latest, 3.13)	3m 55s
build-artifacts / python-test (windows-latest, 3.10)	1m 55s
build-artifacts / python-test (windows-latest, 3.12)	2m 0s
build-artifacts / python-test (windows-latest, 3.13)	2m 58s
build-artifacts / python-test (ubuntu-latest, 3.11)	5m 1s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	47s
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	20s
	58m 29s

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