Add endpoints validators

[tmscarla]

Description

This PR introduces custom validators for the following endpoints:

• /manager/get_dcv_session
• /manager/queue_status
• /manager/cancel_job
• /manager/scontrol_job
• /manager/sacct

Changelog entry

• Added input validators for the following endpoints: get_dcv_session, queue_status, cancel_job, scontrol_job, sacct

How Has This Been Tested?

• Manual tests on local environment with Postman

References

• https://marshmallow.readthedocs.io/en/stable/marshmallow.validate.html

PR Quality Checklist

• [ ] I added tests to new or existing code
• [ ] I removed hardcoded strings and used our i18n solution instead (see here)
• [ ] I made sure no sensitive info gets logged at any time in the codebase (see here) (e.g. no user info or details, no stacktraces, etc.)
• [ ] I checked that infrastructure/update_infrastructure.sh runs without any error
• [x] I checked that npm run build builds without any error
• [x] I checked that clusters are listed correctly
• [ ] I checked that a new cluster can be created (config is produced and dry run passes)
• [ ] I checked that login and logout work as expected

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