Final run method, which runs cloudlflared pre-checks for both the normal startup procedure, as well as cloudflared diag.
For cloudflared diag, this produces a new json output to which is added to the final zip file.
Also added in a new flag to prevent this from running all the time, at least for now until we are 100% sure this works as intended. We will later remove this flag, only leaving in `--no-prechecks`, so this runs by default for everyone using cloudflared.
Tested pre-checks locally with origintunneld. The results show all pre-checks succeeding. In this case, it ran with only 1 region, since locally we run it with `--edge origintunneld1:7844`.
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Fixing warnings in cloudflared log collector.
This attempts to fix errors like the ones shown below:
```
diagnostic/diagnostic.go:132:23: Error return value of `logHandle.Close` is not checked (errcheck)
defer logHandle.Close()
diagnostic/diagnostic.go:134:26: G303: File creation in shared tmp directory without using ioutil.Tempfile (gosec)
outputLogHandle, err := os.Create(filepath.Join(os.TempDir(), logFilename))
```
## Summary
Adds a new CLI subcommand, under the tunnel command, the `diag`. This command has as function the automatic collection of different data points, such as, logs, metrics, network information, system information, tunnel state, and runtime information which will be written to a single zip file.
Closes TUN-8724
## Summary
The initial implementation produced correct JSON however it was not formatted which would make it harder to read the file by an user.
Closes TUN-8784
## Summary
Add a new job that write to a file the result of all of the other tasks along with possible errors. This file is also added to the root of the diagnostic zip file.
Closes TUN-8768
## Summary
Adds two new jobs which will export the cli configuration and tunnel configuration in separate files. These files will also be added to the zipfile's root.
Closes TUN-8770
## Summary
Export raw format of traceroute is widely known and useful for debugging. This raw output is written to the zipfile's root at the end of the diagnostic.
Closes TUN-8767
Miguel da Costa Martins Marcelino
Luis Neto