* Don't add {} to non-metrics starting with quotes
* Fix for using template variables
* Fix adding of filter to timerange
* Fix adding of filter to labels provided with group modifier
* Fix adding of filters to Grafana's variables
* Shorten tests
* Refactor and split
* Chore: updates add label to query method in prometheus datasource to fix loki label insert
* Chore: adds addLabelToQuery test covering differences between adding label to loki vs non-loki queries
* Chore: adds an additional comment to addLabelToQuery
* Chore: renames isLokiDatasource to hasNoMetrics in addLabelToQuery