Incorporate dynamic workspace suffix into UI

[ThomasK33]

Currently we're hardcoding the .coder suffix in the MenuItemView.
With coder/coder#16828 the HostnameSuffix will become a configurable value, thus we need to read that value and adjust the UI accordingly.

[matifali]

I was wondering if we can instead use the same suffix as the CODER_ACCESS_URL. If CODER_WILDCARD_ACCESS_URL is set, we can reuse the wildcard cert for HTTPS apps. I am sure it will conflict with the configured DNS server resolving the CODER_ACCESS_URL and its subdomains.