* Make value mappings corectly interprete numeric-like strings

* More tests

* Update packages/grafana-data/src/utils/valueMappings.ts

* Update packages/grafana-data/src/utils/valueMappings.ts

Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>

* Fix issue detected by singlestat test

Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>