Custom branding: add validation to the plugin's settings

[Desvelao]

Description

We'll add validation to the settings of the plugin, so no invalid values can be set in the Settings / Configuration section.

Objective

• Display errors when the input is invalid.
• Highlight the settings which contain errors.
• Disable configuration saving when there are errors.

Tasks

• Frontend
  • [x] Add validation to each type of input component when its value changes.
  • [x] Highlight the errors of each input.
    • [x] Display the cause of error.
    • [x] Add warning icon to the setting with the errors.
  • [x] Disable the save button when there are errors due to invalid values.
  • [ ] Add unit tests
• Backend
  • [x] Validate route and body parameters of the following endpoints:
    • [x] PUT /utils/configuration
    • [x] PUT /utils/configuration/files/{key}
  • [ ] Tests

Depends on: #4443

[Desvelao]

Add feedback to the form's input

The management of the inputs for the plugin's settings has been improved. The following features have been added:

• An error message is added to the input when its value is invalid.
• The invalid settings are now highlighted in red.
• A warning icon is appended to the invalid settings.
• The total count of invalid settings is now shown in the bottom status bar.
• The button to save the configuration is disabled when there are invalid values.

Screenshots

• Input's validation, invalid settings highlight, error count display and disabled of the save button.

• Warning icon added to the invalid settings, reason displayed on mouse over.

[Desvelao]

• Added validation to each setting of the plugin in the frontend and the backend.

[Desvelao]

• Fixed some settings validation errors
• Updated the development branch with the last changes of the base branch

[Desvelao]

• Added tests to validate the updating of plugin settings using the API endpoint PUT /utils/configuration. (WIP)

[Desvelao]

In the validation, we should consider the values used by cloud environments, to be sure these pass the setting validations.

Some plugin configurations to keep in mind:

• https://github.com/wazuh/wazuh-saas/blob/master/services/internal/environments/common/data/kubernetes/wazuh-dashboard-wazuh-app-configmap.yaml

[asteriscos]

I created a new PR related to this issue to add de validation description to multi-line inputs description.