Should send country abbreviation, not country display name

[adietish]

Our library sends the display name of the country in actions:

"location": {
      "country": "Switzerland"
},

the telemetry for vscode sends the country abbreviation:

"location": {
      "country": "CN"
},

We have to correct this in order to be consistent.
This results in an empty "most recent country" coulum in Woopra activities. This is also causing problems when sending segment data to http://pendo.io/ (instead of woopra)

[adietish]

This could be caused by the following code in our library:
https://github.com/redhat-developer/intellij-redhat-telemetry/blob/main/src/main/java/com/redhat/devtools/intellij/telemetry/core/service/Country.java#L64-L71

        if (abbreviation == null) {
            String alternative = timezone.get(KEY_ALTERNATIVE);
            if (alternative == null) {
                return timezoneId;
            }
            return get(alternative);
        }
        return getDisplayName(abbreviation);