remove even more BackstageTheme usages

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

plugins/cloudbuild/src/components/Cards/Cards.tsx

@@ -19,7 +19,7 @@ import { useWorkflowRuns, WorkflowRun } from '../useWorkflowRuns';
 import { WorkflowRunsTable } from '../WorkflowRunsTable';
 import { useEntity } from '@backstage/plugin-catalog-react';
 import { WorkflowRunStatus } from '../WorkflowRunStatus';
-import { Theme, makeStyles, LinearProgress } from '@material-ui/core';
+import { makeStyles, LinearProgress } from '@material-ui/core';
 import ExternalLinkIcon from '@material-ui/icons/Launch';
 import { CLOUDBUILD_ANNOTATION } from '../useProjectName';
 
@@ -31,7 +31,7 @@ import {
 } from '@backstage/core-components';
 import { errorApiRef, useApi } from '@backstage/core-plugin-api';
 
-const useStyles = makeStyles<Theme>({
+const useStyles = makeStyles({
   externalLinkIcon: {
     fontSize: 'inherit',
     verticalAlign: 'bottom',

plugins/cloudbuild/src/components/WorkflowRunDetails/WorkflowRunDetails.tsx

@@ -25,7 +25,6 @@ import {
   TableCell,
   TableContainer,
   TableRow,
-  Theme,
   Typography,
 } from '@material-ui/core';
 import ExternalLinkIcon from '@material-ui/icons/Launch';
@@ -36,7 +35,7 @@ import { WorkflowRunStatus } from '../WorkflowRunStatus';
 import { useWorkflowRunsDetails } from './useWorkflowRunsDetails';
 import { Breadcrumbs, Link, WarningPanel } from '@backstage/core-components';
 
-const useStyles = makeStyles<Theme>(theme => ({
+const useStyles = makeStyles(theme => ({
   root: {
     maxWidth: 720,
     margin: theme.spacing(2),