Maintence mode doesn't work

[Zelenevskii Vadim]

Mistral has maintance mode which doesn't work now at all:

1. MaintenceHook doesn't included in app.
2. Sql queries are wrong. They have missprints and it leads to incorrect execution.
3. Rest endpoint {mistral}/maintance doesn't work due to 2 point
4. maintence.py service doesn't work because it has not supported paramentes in some places

So, maintence mode must be fully refactored.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/mistral/+/913334

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/mistral/+/913334
Committed: https://opendev.org/openstack/mistral/commit/cadfe9dca2490afc05d2c2489db700a417cd0f0d
Submitter: "Zuul (22348)"
Branch: master

commit cadfe9dca2490afc05d2c2489db700a417cd0f0d
Author: Vadim Zelenevsky <email address hidden>
Date: Fri Mar 22 22:11:12 2024 +0300

    Fix maintence mode

    Added MaintenceHook to app configuration
    Refactored maintence service
    Fixed sql queries
    Fix maintence controller

    Closes-Bug: #2058009
    Signed-off-by: Vadim Zelenevsky <email address hidden>
    Change-Id: Ica41e8208b29aeba6e781801540843d46375c3d1