Refactored `ListHostSoftware` and `ModifyAppConfig` into smaller helpers
so nilaway can analyze them for nil-pointer dereferences
<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#46554
Refactoring. No functional changes.
# 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] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Improved host software listing by consolidating assembly, merging,
deduplication, and out-of-scope filtering into dedicated helpers for
more reliable and maintainable results.
* Streamlined app configuration updates by extracting conditional-access
(Okta) validation into a focused helper, improving validation
consistency and error reporting.
* **Chores**
* Updated static analysis configuration: bumped a pinned plugin version
and removed a suppression rule that hid certain internal lint messages.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Victor Lyuboslavsky
0858580ff5