UI: Make SimpleTable sorting icons match ResourceTable (#4944)

[Utkarshpandey0001]

This PR updates the sorting icons in the SimpleTable component to visually match the standard MUI arrow styling used natively by ResourceTable . It also introduces tooltips for the sorting buttons to improve accessibility and clarity, bringing it to full feature parity with the rest of the application.

[k8s-ci-robot]

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[skoeva]

looks like there are some snapshots failing, can you check if those are related? you can see the errors locally with make frontend-test

[Utkarshpandey0001]

@skoeva sure , let me check once and get back to u

[Utkarshpandey0001]

@skoeva
Good catch, I ran make frontend-test and found that the visual snapshots were failing because of the new icons and tooltips. I've updated the snapshots to reflect the new UI changes. I also added the newly introduced swap-vertical icon to the offline cache registry (icons.ts) so that icons.test.ts passes correctly. Everything is green locally now.