UI for scheduling batch scripts (#31885)

# Details

This PR merges the feature branch for the scheduled scripts UI into
main. This includes the following previously-approved PRs:

* https://github.com/fleetdm/fleet/pull/31750
* https://github.com/fleetdm/fleet/pull/31604
* https://github.com/fleetdm/fleet/pull/31797


# Checklist for submitter

If some of the following don't apply, delete the relevant line.

- [X] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.

## Testing

- [X] Added/updated automated tests
- [X] Where appropriate, [automated tests simulate multiple hosts and
test for host
isolation](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/reference/patterns-backend.md#unit-testing)
(updates to one hosts's records do not affect another)

- [X] QA'd all new/changed functionality manually

---------

Co-authored-by: jacobshandling <61553566+jacobshandling@users.noreply.github.com>
Co-authored-by: Jacob Shandling <jacob@fleetdm.com>

changes/30526-update-run-script-modal

@@ -0,0 +1 @@
+- Added ability to schedule batch script runs in advance to the "Run scripts" modal

changes/31224-scripts-page-updates

@@ -0,0 +1,3 @@
+* Build side navigation on the Controls > Scripts page, with the previous Scripts page content under
+the "Library" tab and a new "Batch progress" tab containing details about started, scheduled, and
+finished scripts.

changes/31567-allow-canceling-from-modal

@@ -0,0 +1 @@
+- Added the ability to cancel batch script runs directly from the summary modal