[Issue] Add UpToDateThemes validator to setup:db:status

[m2-assistant]

This issue is automatically created based on existing pull request: #39383: Add UpToDateThemes validator to setup:db:status

---

Description (*)

Running bin/magento setup:db:status right now does not check whether there is a theme update. If the only change in the deploy is a theme being added, bin/magento setup:db:status will now show;

$ bin/magento setup:db:status
All modules are up to date.

However if you were to run bin/magento setup:upgrade, you'd get this message;

$ bin/magento setup:upgrade
Processing configurations data from configuration file...
The following themes will be registered: frontend/Hyva/Elgentos
Do you want to continue [yes/no]?

With the change in this MR, we'll get this output from setup:db:status;

$ bin/magento setup:db:status
Themes are not up to date
Run 'setup:upgrade' to update your DB schema and data.

Since we rely on the output of setup:db:status to decide whether or not to run setup:upgrade in our deployment pipeline (to make near-zero downtime deployments possible), this is tripping us up from time to time.

This PR aims to add a validator to check whether there are theme changes, forcing setup:upgrade to run.

Thanks to @johnorourke for pointing this out.

[m2-assistant]

Hi @engcom-Delta. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).
• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue.
• 3. Add Area: XXXXX label to the ticket, indicating the functional areas it may be related to.
• 4. Verify that the issue is reproducible on 2.4-develop branch
  Details

  - If the issue is reproducible on 2.4-develop branch, please, add the label Reproduced on 2.4.x.
  - If the issue is not reproducible, add your comment that issue is not reproducible and close the issue and stop verification process here!
• 5. Add label Issue: Confirmed once verification is complete.
• 6. Make sure that automatic system confirms that report has been added to the backlog.

[engcom-Delta]

Hi @peterjaap ,

Thanks for your reporting and collaboration.
It is an improvement so we will mark ticket as feature request.

Thanks.