<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** For #40348
# Details
This PR replaces the use of "No team" with "Unassigned" and "All teams"
with "All fleets" in appropriate checks and error messages. Specifically
it restricts using "All fleets" or "Unassigned" as team names
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [ ] 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.
n/a
## Testing
- [X] Added/updated automated tests
- [X] QA'd all new/changed functionality manually
* tested attempting to add "no team", "all teams", "unassigned" and "all
fleets" as teams and saw appropriate error message
Scott Gress
824a0f0cc4