## What this PR does
Restores `stock-instance-api-form`, `stock-instance-api-table`,
`stock-instance-builtin-form`, and `stock-instance-builtin-table`
sidebar
resources that were removed in #2106, and adds them back to the orphan
cleanup allowlist.
PR #2106 removed these sidebars to fix broken URLs on the main page
before
namespace selection (`default//api-table/...`). However,
`stock-instance-*`
sidebars are required by the frontend for namespace-level
api-table/api-form
pages. Without them and with `CUSTOMIZATION_SIDEBAR_FALLBACK_ID=""`, the
frontend cannot find a sidebar for pages like Backup Plans and renders
an
empty page where no interaction is possible.
The broken-URL bug is already fully fixed by
`CUSTOMIZATION_SIDEBAR_FALLBACK_ID=""`
in `web.yaml`. Re-adding `stock-instance-*` does not reintroduce it,
since
these sidebars are only shown when the user is on a namespace-level page
where the `{namespace}` placeholder is filled.
### Release note
```release-note
[dashboard] fix empty page on Backup Plans and other namespace-level api-table pages
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added four new dashboard sidebar resources for stock instances: API
form, API table, built-in form, and built-in table views. These enable
expanded dashboard customization options for managing stock instance
configurations and data.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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