[jetbrains] extend IDE backend label

[akosyakov]

Instead we should show there Gitpod logo and workspace id. In the dropdown menu we can add common actions, see #8024

We should override com.jetbrains.rdserver.unattendedHost.customization.GatewayClientCustomization for it. It is also possible to add actions to the dropdown menu by adding your actions to the UnattendedHostDropdownGroup action group.

[akosyakov]

We had to revert it for now, since branding can cause JB backend freeze as for now: #8542 It will be improved in future versions and we can try again.

[felladrin]

Recently, JetBrains team indicated us how to make it work, so I'll note it here for us to work on it later:

On plugin.xml add the following line inside <extensions defaultExtensionNs="com.intellij">:

<gateway.customization.name implementation="io.gitpod.jetbrains.remote.GitpodGatewayClientCustomizationProvider"/>

Then create a GitpodGatewayClientCustomizationProvider.kt file with the following content:

class GitpodGatewayClientCustomizationProvider : GatewayClientCustomizationProvider {
  override val icon: Icon = GitpodIcons.Logo
  override val title: String = "Gitpod"

  override val controlCenter: GatewayControlCenterProvider = object : GatewayControlCenterProvider {
    override fun getHostnameDisplayKind() = GatewayHostnameDisplayKind.ShowHostnameOnNavbar
    override fun getHostnameShort() = System.getenv("GITPOD_WORKSPACE_ID") ?: "Gitpod"
    override fun getHostnameLong() = getHostnameShort()
  }
}

Note: GitpodIcons is imported from here.