fix(welcome): saved queries causing error

[villebro]

SUMMARY

A recent PR #19223 caused a regression due to trying to query for saved_query objects by their owners, despite the model only having a creator (there is no saved_query_user, like there is for dashboard_user for dashboards and slice_user for slices). This renames the getUserOwnedObjects to getUserObjects and adds a parameter filterBy which makes it possible to define whether or not to query by owners or created_by.

AFTER

After the change, the welcome page loads without errors:

BEFORE

Previously there was an error toast caused by a 400:

TESTING INSTRUCTIONS

1. Go to welcome page
2. Verify that the error no longer happens

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[villebro]

Closing as this is a duplicate of #19372