32751 Change installer add/edit endpoints to read from writer db instead of reader (#33820)

<!-- Add the related story/sub-task/bug number, like Resolves #123, or
remove if NA -->
**Related issue:** Resolves #32751 

# 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.

- [ ] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)
- [ ] If paths of existing endpoints are modified without backwards
compatibility, checked the frontend/CLI for any necessary changes

## Testing

- [x] Added/updated automated tests
- [ ] 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)

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

---------

Co-authored-by: Jahziel Villasana-Espinoza <jahziel@fleetdm.com>

ee/server/service/software_installers.go

@@ -19,6 +19,7 @@ import (
 	"github.com/fleetdm/fleet/v4/server"
 	"github.com/fleetdm/fleet/v4/server/authz"
 	authz_ctx "github.com/fleetdm/fleet/v4/server/contexts/authz"
+	"github.com/fleetdm/fleet/v4/server/contexts/ctxdb"
 	"github.com/fleetdm/fleet/v4/server/contexts/ctxerr"
 	hostctx "github.com/fleetdm/fleet/v4/server/contexts/host"
 	"github.com/fleetdm/fleet/v4/server/contexts/viewer"
@@ -152,7 +153,7 @@ func (svc *Service) UploadSoftwareInstaller(ctx context.Context, payload *fleet.
 	if payload.TeamID != nil {
 		tmID = *payload.TeamID
 	}
-	addedInstaller, err := svc.ds.GetSoftwareInstallerMetadataByTeamAndTitleID(ctx, &tmID, titleID, true)
+	addedInstaller, err := svc.ds.GetSoftwareInstallerMetadataByTeamAndTitleID(ctxdb.RequirePrimary(ctx, true), &tmID, titleID, true)
 	if err != nil {
 		return nil, ctxerr.Wrap(ctx, err, "getting added software installer")
 	}
@@ -599,7 +600,7 @@ func (svc *Service) UpdateSoftwareInstaller(ctx context.Context, payload *fleet.
 	}
 
 	// re-pull installer from database to ensure any side effects are accounted for; may be able to optimize this out later
-	updatedInstaller, err := svc.ds.GetSoftwareInstallerMetadataByTeamAndTitleID(ctx, payload.TeamID, payload.TitleID, true)
+	updatedInstaller, err := svc.ds.GetSoftwareInstallerMetadataByTeamAndTitleID(ctxdb.RequirePrimary(ctx, true), payload.TeamID, payload.TitleID, true)
 	if err != nil {
 		return nil, ctxerr.Wrap(ctx, err, "re-hydrating updated installer metadata")
 	}