add tests for dcm

[andre-urbani]

What

Added the following tests for the DCM -

• view the DCM homepage
• find a dataset and version
• search for a dataset by ID
• search for a dataset with an invalid ID
• create a new dataset series
• create a new edition for a dataset series
• create a new version for a dataset edition

Jira - https://officefornationalstatistics.atlassian.net/jira/software/c/projects/DIS/boards/1822?selectedIssue=DIS-5059

How to review

Run make test and confirm that all tests pass
There is a current issue in dis-data-admin-ui that @jondewijones will be creating a fix for. If that fix hasn't gone through by the time this PR is reviewed, you will have to change the following code locally otherwise some of the tests will not work. On this line in dis-data-admin-ui - https://github.com/ONSdigital/dis-data-admin-ui/blob/develop/src/utils/config/config.js#L6 - replace it with -

const getAPIRouterURL = (envVars) => {
    const apiRouterURL = envVars.API_ROUTER_URL;
    if (apiRouterURL.includes("dp-api-router:23200")) {
        return "http://localhost:23200/v1";
    }
    return apiRouterURL || null;
};

You may also have to do a make refresh on the dis-data-admin-ui, dp-files-api and dp-upload-service

Confirm changes make sense

Who can review

Anyone