Dashboard with same name break download/deploy functionality

[tobigremmer-dt]

Describe the bug
If multiple dashboards exist that have the same name, download and deploy does not work correctly.

1. A single .json is overwritten, every time a dashboard is downloaded with the same name
2. Single .json is deployed (probably last instance in list?) which breaks all backup use cases.

For example, an environment has 2 dashboards called "Applications", 4 dashboards called "Config". All instances are detected but only single Config.json and single Applications.json is downloaded. Also, instances are merged into single identifier (i.e. "Applications" and "Config") which have multiple list items with key "name":

config:
- Applications: Applications
- Config: Config.json
- Config: Config.json
- Applications: Applications
- Config: Config.json
- Config: Config.json
 
Applications:
- name: 'Applications'
- name: 'Applications'

Config:
- name: Config
- name: Config
- name: Config
- name: Config

This issue was mentioned in #179 already. However, I feel this issue requires a dedicated (and timely) fix as this breaks functionality.