feat(cat-gateway): Service Readiness check

[saibatizoku]

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[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 578/583}$ | ${\color{red}Fail: 0/583}$ |

[github-actions]

❌ Test Report | ${\color{lightgreen}Pass: 577/583}$ | ${\color{red}Fail: 1/583}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 590/595}$ | ${\color{red}Fail: 0/595}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 592/597}$ | ${\color{red}Fail: 0/597}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 603/608}$ | ${\color{red}Fail: 0/608}$ |

[saibatizoku]

Close in favor of #1974 .