Check the validation of brum_site_id to match the UUID format

[ceckoslab]

We found that a Basircrum user entered by mistake the hostname in instead of the brum_site_id in the plugin settings.

The mistake was that the user entered www.example.com instead of 22125988-0d99-4035-8eb5-2bccc5d8f661 .

We could find the mistake in the generated config:

w.BOOMR_mq.push(["addVar", {"brum_site_id":"www.example.com"}]);

Where the correct one supposed to be:

w.BOOMR_mq.push(["addVar", {"brum_site_id":"22125988-0d99-4035-8eb5-2bccc5d8f661"}]);

Full snipped containing the error:

<script id="basicrum-config-js-after">
(function(w) {
  if (!w) { return; }
  w.BOOMR = w.BOOMR || {};
  w.BOOMR.plugins = w.BOOMR.plugins || {};
  w.BOOMR_mq = w.BOOMR_mq || [];
  w.BOOMR_mq.push(["addVar", {"p_type":"page"}]);
  w.BOOMR_mq.push(["addVar", {"p_gen":"wp"}]);
  w.BOOMR_mq.push(["addVar", {"brum_site_id":"www.example.com"}]);
  w.BOOMR.url = "https:\/\/www.example.com\/wp-content\/plugins\/basicrum\/assets\/js\/boomr\/boomerang-1.815.60.cutting-edge.min.js";

  w.basicRumBoomerangConfig = {
    "beacon_url": "https://beacon.beta.basicrum.com/beacon/catcher",
    "instrument_xhr": false,
    "strip_query_string": false,
    "Continuity": {
        "enabled": true
    },
    "ResourceTiming": {
        "enabled": true,
        "splitAtPath": true
    },
    "secure_cookie": true,
    "same_site_cookie": "Strict"
};
})(window);
//# sourceURL=basicrum-config-js-after
</script>