feat(site): add a provisioner warning to workspace builds (#15686)

This PR adds warnings about provisioner health to workspace build pages.
It closes https://github.com/coder/coder/issues/15048


![image](https://github.com/user-attachments/assets/fa54d0e8-c51f-427a-8f66-7e5dbbc9baca)

![image](https://github.com/user-attachments/assets/b5169669-ab05-43d5-8553-315a3099b4fd)

coderd/database/dbmem/dbmem.go

@@ -1120,6 +1120,14 @@ func (q *FakeQuerier) getWorkspaceAgentScriptsByAgentIDsNoLock(ids []uuid.UUID)
 	return scripts, nil
 }
 
+// getOwnerFromTags returns the lowercase owner from tags, matching SQL's COALESCE(tags ->> 'owner', ”)
+func getOwnerFromTags(tags map[string]string) string {
+	if owner, ok := tags["owner"]; ok {
+		return strings.ToLower(owner)
+	}
+	return ""
+}
+
 func (*FakeQuerier) AcquireLock(_ context.Context, _ int64) error {
 	return xerrors.New("AcquireLock must only be called within a transaction")
 }
@@ -2773,6 +2781,63 @@ func (q *FakeQuerier) GetDeploymentWorkspaceStats(ctx context.Context) (database
 	return stat, nil
 }
 
+func (q *FakeQuerier) GetEligibleProvisionerDaemonsByProvisionerJobIDs(_ context.Context, provisionerJobIds []uuid.UUID) ([]database.GetEligibleProvisionerDaemonsByProvisionerJobIDsRow, error) {
+	q.mutex.RLock()
+	defer q.mutex.RUnlock()
+
+	results := make([]database.GetEligibleProvisionerDaemonsByProvisionerJobIDsRow, 0)
+	seen := make(map[string]struct{}) // Track unique combinations
+
+	for _, jobID := range provisionerJobIds {
+		var job database.ProvisionerJob
+		found := false
+		for _, j := range q.provisionerJobs {
+			if j.ID == jobID {
+				job = j
+				found = true
+				break
+			}
+		}
+		if !found {
+			continue
+		}
+
+		for _, daemon := range q.provisionerDaemons {
+			if daemon.OrganizationID != job.OrganizationID {
+				continue
+			}
+
+			if !tagsSubset(job.Tags, daemon.Tags) {
+				continue
+			}
+
+			provisionerMatches := false
+			for _, p := range daemon.Provisioners {
+				if p == job.Provisioner {
+					provisionerMatches = true
+					break
+				}
+			}
+			if !provisionerMatches {
+				continue
+			}
+
+			key := jobID.String() + "-" + daemon.ID.String()
+			if _, exists := seen[key]; exists {
+				continue
+			}
+			seen[key] = struct{}{}
+
+			results = append(results, database.GetEligibleProvisionerDaemonsByProvisionerJobIDsRow{
+				JobID:             jobID,
+				ProvisionerDaemon: daemon,
+			})
+		}
+	}
+
+	return results, nil
+}
+
 func (q *FakeQuerier) GetExternalAuthLink(_ context.Context, arg database.GetExternalAuthLinkParams) (database.ExternalAuthLink, error) {
 	if err := validateDatabaseType(arg); err != nil {
 		return database.ExternalAuthLink{}, err
@@ -10344,25 +10409,26 @@ func (q *FakeQuerier) UpsertOAuthSigningKey(_ context.Context, value string) err
 }
 
 func (q *FakeQuerier) UpsertProvisionerDaemon(_ context.Context, arg database.UpsertProvisionerDaemonParams) (database.ProvisionerDaemon, error) {
-	err := validateDatabaseType(arg)
-	if err != nil {
+	if err := validateDatabaseType(arg); err != nil {
 		return database.ProvisionerDaemon{}, err
 	}
 
 	q.mutex.Lock()
 	defer q.mutex.Unlock()
-	for _, d := range q.provisionerDaemons {
-		if d.Name == arg.Name {
-			if d.Tags[provisionersdk.TagScope] == provisionersdk.ScopeOrganization && arg.Tags[provisionersdk.TagOwner] != "" {
-				continue
-			}
-			if d.Tags[provisionersdk.TagScope] == provisionersdk.ScopeUser && arg.Tags[provisionersdk.TagOwner] != d.Tags[provisionersdk.TagOwner] {
-				continue
-			}
+
+	// Look for existing daemon using the same composite key as SQL
+	for i, d := range q.provisionerDaemons {
+		if d.OrganizationID == arg.OrganizationID &&
+			d.Name == arg.Name &&
+			getOwnerFromTags(d.Tags) == getOwnerFromTags(arg.Tags) {
 			d.Provisioners = arg.Provisioners
 			d.Tags = maps.Clone(arg.Tags)
-			d.Version = arg.Version
 			d.LastSeenAt = arg.LastSeenAt
+			d.Version = arg.Version
+			d.APIVersion = arg.APIVersion
+			d.OrganizationID = arg.OrganizationID
+			d.KeyID = arg.KeyID
+			q.provisionerDaemons[i] = d
 			return d, nil
 		}
 	}
@@ -10372,7 +10438,6 @@ func (q *FakeQuerier) UpsertProvisionerDaemon(_ context.Context, arg database.Up
 		Name:           arg.Name,
 		Provisioners:   arg.Provisioners,
 		Tags:           maps.Clone(arg.Tags),
-		ReplicaID:      uuid.NullUUID{},
 		LastSeenAt:     arg.LastSeenAt,
 		Version:        arg.Version,
 		APIVersion:     arg.APIVersion,