Meta doctor should check metatype.yml targets

[zifeo]

For each target in metatype.yml:

• check host reachability and typegate status
• check secrets accesses

[vishalpawarR]

@zifeo need some explanation and screenshot for helping in fixing this issue

[zifeo]

@vishalpawarR here are a few pointers if you want to give it a shot:

• meta doctor should be as helpful as possible troubleshooting errors
• some checks already exist
• in the metatype.yml you have some targets (like dev) that can be checked
• secrets presence can be check like there