message: add noopener to external tab links
diff: </m.ActionStatusArea>
  {{#if this.unlockTxnViewerUrl}}
  <m.InfoArea>
  - <Boxel::Button @as="anchor" @size="extra-small" @href={{this.unlockTxnViewerUrl}} target="_blank">
  + <Boxel::Button @as="anchor" @size="extra-small" @href={{this.unlockTxnViewerUrl}} target="_blank" rel="noopener">
  View on Etherscan
  </Boxel::Button>
  </m.InfoArea>
  </m.ActionStatusArea>
  {{#if this.depositTxnViewerUrl}}
  <m.InfoArea>
  - <Boxel::Button @as="anchor" @size="extra-small" @href={{this.depositTxnViewerUrl}} target="_blank">
  + <Boxel::Button @as="anchor" @size="extra-small" @href={{this.depositTxnViewerUrl}} target="_blank" rel="noopener">
  View on Etherscan
  </Boxel::Button>
  </m.InfoArea>
  