* feat: Add connection_timeout and troubleshooting_url to agent
This commit adds the connection timeout and troubleshooting url fields
to coder agents.
If an initial connection cannot be established within connection timeout
seconds, then the agent status will be marked as `"timeout"`.
The troubleshooting URL will be present, if configured in the Terraform
template, it can be presented to the user when the agent state is either
`"timeout"` or `"disconnected"`.
Fixes#4678
* feat: use app wildcards for apps if configured
* feat: relative_path -> subdomain
- rename relative_path -> subdomain when referring to apps
- migrate workspace_apps.relative_path to workspace_apps.subdomain
- upgrade coder/coder terraform module to 0.5.0
This cleans up agent association code to explicitly map a single
agent to a single resource. This will fix#1884, and unblock
a prospect from beginning a POC.
Mathias Fredriksson
Ammar Bandukwala
Dean Sheather
Garrett Delfosse
Bruno Quaresma
David Wahler
Kyle Carberry