feat: add user-level parameter autofill (#11731)

This PR solves #10478 by auto-filling previously used template values in create and update workspace flows.

I decided against explicit user values in settings for these reasons:

* Autofill is far easier to implement
* Users benefit from autofill _by default_ — we don't need to teach them new concepts
* If we decide that autofill creates more harm than good, we can remove it without breaking compatibility

coderd/database/queries.sql.go

@@ -9939,6 +9939,62 @@ func (q *sqlQuerier) InsertWorkspaceAppStats(ctx context.Context, arg InsertWork
 	return err
 }
 
+const getUserWorkspaceBuildParameters = `-- name: GetUserWorkspaceBuildParameters :many
+SELECT DISTINCT ON (tvp.name)
+    tvp.name,
+    wbp.value
+FROM
+    workspace_build_parameters wbp
+JOIN
+    workspace_builds wb ON wb.id = wbp.workspace_build_id
+JOIN
+    workspaces w ON w.id = wb.workspace_id
+JOIN
+    template_version_parameters tvp ON tvp.template_version_id = wb.template_version_id
+WHERE
+    w.owner_id = $1
+    AND wb.transition = 'start'
+    AND w.template_id = $2
+    AND tvp.ephemeral = false
+    AND tvp.name = wbp.name
+ORDER BY
+    tvp.name, wb.created_at DESC
+LIMIT 100
+`
+
+type GetUserWorkspaceBuildParametersParams struct {
+	OwnerID    uuid.UUID `db:"owner_id" json:"owner_id"`
+	TemplateID uuid.UUID `db:"template_id" json:"template_id"`
+}
+
+type GetUserWorkspaceBuildParametersRow struct {
+	Name  string `db:"name" json:"name"`
+	Value string `db:"value" json:"value"`
+}
+
+func (q *sqlQuerier) GetUserWorkspaceBuildParameters(ctx context.Context, arg GetUserWorkspaceBuildParametersParams) ([]GetUserWorkspaceBuildParametersRow, error) {
+	rows, err := q.db.QueryContext(ctx, getUserWorkspaceBuildParameters, arg.OwnerID, arg.TemplateID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []GetUserWorkspaceBuildParametersRow
+	for rows.Next() {
+		var i GetUserWorkspaceBuildParametersRow
+		if err := rows.Scan(&i.Name, &i.Value); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const getWorkspaceBuildParameters = `-- name: GetWorkspaceBuildParameters :many
 SELECT
     workspace_build_id, name, value