[BUG] Fix jsondata key in grafana_datasources variable

[ommarmol]

Description

The default variable grafana_datasources contains a typo using the key jsonData as can be seen here. The typo is also carried over to the jinja template used to process this variable.

This typo forces the use of the jsondata key when defining datasources, which could lead to errors when using official YAML configurations from Grafana.

Steps to Reproduce

1. Define a datasource in the variable grafana_datasources containing the correct key jsonData.
2. Use the role.

Expected behavior:
The role should create the datasource successfully.

Actual behavior:
The role crashes as the template datasource.json.j2 cannot find the key jsondata.

Reproduces how often:
Every time a datasource is defined containing the key jsonData.

Environment

• The release version/s you are using: 2.0.0 of this role
• OS: supported versions of Debian/Ubuntu

Additional Information

https://grafana.com/docs/grafana/latest/datasources/