Explore: Fix height on horizontal drawer and query inspector (#47832)

* Move tab height and horizontal drawer height to themable variables so they can be referred to. Add a default height to tabbed container so it can set an explicit height. Add overflow: scroll to inspector content

* Use height variable that changes on resize

* Use css to set height

public/app/features/inspector/styles.ts

@@ -26,6 +26,7 @@ export const getPanelInspectorStyles = stylesFactory(() => {
     content: css`
       flex-grow: 1;
       height: 100%;
+      overflow: scroll;
     `,
     editor: css`
       font-family: monospace;