Revert onboarding form defaults change and upgrade rjsf (#3726)

## Description

WATonomous/infra-config#3707 broke the
onboarding form, where the submit button would work on an empty form,
but cause a JavaScript error. This PR reverts the changes.

This PR also upgrades rjsf to the latest version.


## Checklist
- [x] I have read and understood the [WATcloud
Guidelines](https://cloud.watonomous.ca/docs/community-docs/watcloud/guidelines)
- [x] I have performed a self-review of my code

components/onboarding-form.tsx

@@ -363,11 +363,6 @@ export default function OnboardingForm() {
           showRootDescription: false,
           showAdvancedFields,
         }}
-        experimental_defaultFormStateBehavior={{
-          // Only populate required default values. This prevents the form from unnecessarily adding default values to fields.
-          // Docs: https://rjsf-team.github.io/react-jsonschema-form/docs/api-reference/form-props/#emptyobjectfields
-          emptyObjectFields: 'populateRequiredDefaults',
-        }}
       >
         <div className="mt-8 space-x-4">
           <Button type="submit">Submit</Button>

scripts/validate-external-links.py

@@ -23,7 +23,10 @@
 WHITELISTED_PREFIXES = [
     "https://github.com/WATonomous/infra-config",
     "https://github.com/WATonomous/infra-notes",
-    "https://jira.watonomous.ca"
+    "https://jira.watonomous.ca",
+    # FIXME: ceph.io is down and blocking PRs. This is a temporary workaround
+    # Discussion here: https://discord.com/channels/478659303167885314/1331445846121644133
+    "https://ceph.io",
 ]
 
 # These are the URL schemes that are treated as links (internal and external)