feat: add shared filter to workspaces query (#19807)

Adds a `shared:<boolean>` search query to the `/workspaces [get]`
endpoint


https://github.com/user-attachments/assets/ccf84bd9-c1fd-4085-825b-2e3176a2d488

Closes
[coder/internal#972](https://github.com/coder/internal/issues/972)

codersdk/workspaces.go

@@ -516,6 +516,8 @@ type WorkspaceFilter struct {
 	Offset int `json:"offset,omitempty" typescript:"-"`
 	// Limit is a limit on the number of workspaces returned.
 	Limit int `json:"limit,omitempty" typescript:"-"`
+	// Shared is a whether the workspace is shared with any users or groups
+	Shared *bool `json:"shared,omitempty" typescript:"-"`
 	// FilterQuery supports a raw filter query string
 	FilterQuery string `json:"q,omitempty"`
 }
@@ -539,6 +541,9 @@ func (f WorkspaceFilter) asRequestOption() RequestOption {
 		if f.Status != "" {
 			params = append(params, fmt.Sprintf("status:%q", f.Status))
 		}
+		if f.Shared != nil {
+			params = append(params, fmt.Sprintf("shared:%v", *f.Shared))
+		}
 		if f.FilterQuery != "" {
 			// If custom stuff is added, just add it on here.
 			params = append(params, f.FilterQuery)