chore: remove paver update_db task

[solababs]

Description

As part of the effort to deprecate paver overall hence the update_db task is being removed here.
This change would break any references to the paver update_db task.
Effort has been made to remove all refrences that can be found in other repos and would be linked to this PR appropiately.
Additional work to convert to an alternative make migrate has been done as part of openedx-unsupported/devstack#1085 and any left over work would be done and linked to this PR appropiately.

Supporting information

This PR fixes #32683 and #32252

Testing instructions

Before this change, you could run paver update_db in the lms.
After this change, on running paver update_db you should get an error message like Build failed: Unknown task: update_db
There are no references to this task in the docs.

Fixes: #32683 and #32252
Private-ref: https://tasks.opencraft.com/browse/BB-7705

[openedx-webhooks]

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[e0d]

Hi @solababs , I notice there are some commit-lint failures. Please note that we use conventional commits across Open edX projects. You can read about the details here. Can you please amend your commit messages to follow our standard?

There also seem to be some unit test failure. Can you have a look at those as well?

[solababs]

Closing this PR as same work has been done here #32832