Plugins Catalog: Fix styling of hyperlinks (#48196) (#48341)

Adds some styling (default hyperlink color and underline on hover) to
plugin header and body hyperlinks.

Fixes #48078

(cherry picked from commit 199cacc7b6)

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

public/app/features/plugins/admin/components/PluginDetailsBody.tsx

@@ -101,5 +101,14 @@ export const getStyles = (theme: GrafanaTheme2) => ({
         margin: ${theme.spacing()} 0;
       }
     }
+
+    a {
+      color: ${theme.colors.text.link};
+
+      &:hover {
+        color: ${theme.colors.text.link};
+        text-decoration: underline;
+      }
+    }
   `,
 });

public/app/features/plugins/admin/components/PluginDetailsHeader.tsx

@@ -142,6 +142,12 @@ export const getStyles = (theme: GrafanaTheme2) => {
         }
       }
       font-size: ${theme.typography.h4.fontSize};
+
+      a {
+        &:hover {
+          text-decoration: underline;
+        }
+      }
     `,
     headerInformationRowSecondary: css`
       font-size: ${theme.typography.body.fontSize};