fix(config-api): removing CB and MySqlDB endpoints and swagger fixes

[pujavs]

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Description

Target issue

closes #1766, #1764

Implementation Details

CB and MySql endpoint removed post discussion with @yurem
Removed non-mandatory field from mandatory attribute list for Custom Script

Test and Document the changes

• Static code analysis has been run locally and issues have been fixed
• Relevant unit and integration tests have been added/updated
• Relevant documentation has been updated if any (i.e. user guides, installation and configuration guides, technical design docs etc)

[sonarcloud]

[jans-config-api-parent] Kudos, SonarCloud Quality Gate passed!   

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