tests/interaction: era-axis machinery for the requirements manifest #2778

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	50s
checks / test (3.10, locked, ubuntu-latest)	1m 1s
checks / test (3.12, locked, ubuntu-latest)	1m 4s
checks / test (3.12, lowest-direct, windows-latest)	2m 36s
checks / test (3.11, locked, ubuntu-latest)	58s
checks / test (3.10, locked, windows-latest)	1m 26s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.12, locked, windows-latest)	1m 28s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.14, locked, ubuntu-latest)	1m 51s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.11, lowest-direct, windows-latest)	1m 32s
checks / test (3.13, lowest-direct, windows-latest)	1m 31s
checks / test (3.11, locked, windows-latest)	1m 31s
checks / test (3.10, lowest-direct, windows-latest)	1m 58s
checks / test (3.13, locked, ubuntu-latest)	54s
checks / test (3.14, lowest-direct, ubuntu-latest)	54s
checks / test (3.14, lowest-direct, windows-latest)	1m 58s
checks / test (3.13, locked, windows-latest)	1m 31s
checks / test (3.12, lowest-direct, ubuntu-latest)	57s
checks / test (3.14, locked, windows-latest)	2m 24s
all-green	3s
	29m 50s

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