Fix typo on alloy values

https://repo1.dso.mil/big-bang/bigbang/-/blob/c17d817a65e18f23cbafc0705a22b3ac41cb35c4/chart/values.yaml#L788-790

Change this

    # -- Toggle Alloy to collect logs
  alloyMetrics:
    enabled: true

To this

  # -- Toggle Alloy to collect metrics
  alloyMetrics:
    enabled: true