* DevEnv: updates npm 6.13.4 -> 6.13.7

* DevEnv: updates nodemon 1.18.10 -> 2.0.2

* DevEnv: updates typescript 3.7.2 -> 3.7.5

* DevEnv: removes npm from dev dependencies

* DevEnv: updates typescript 3.7.2 -> 3.7.5 in grafana-data package

* DevEnv: updates typescript 3.7.2 -> 3.7.5 in grafana-e2e package

* DevEnv: updates typescript 3.7.2 -> 3.7.5 in grafana-toolkit package

* DevEnv: updates typescript 3.7.2 -> 3.7.5 in grafana-ui package

* DevEnv: updates typescript 3.7.2 -> 3.7.5 in grafana-runtime package