Add a check to see if database , collection and Permissionsgroup already exist when API to setup Metabase is hit [DMP 2024]

[ombhardwajj]

What

Currently when the API is hit more than once , the code stops executing when it reaches metabase Group creation
Group metabaseGroup = groupPermissionsRepository.save(new Group(name));
but duplicate database and collection will be created.
We need to stop this duplication.

Acceptance Criteria:

• Make sure that database , collection and permissionsgroup are created if and only if they dont exist

Related Issue : avniproject/avni-product#1562

[petmongrels]

1. minor comment - an error log file has been commited. other than removing it, you may also put a .gitignore for it.
2. new ObjectMapper() - I cannot tell from this commit alone, but in the codebase there should be only one place where ObjectMapper should be instantiated. We have a singleton in avni-server for this already - please use that. The reason for this is that new ObjectMapper() internally generates classes which would be private to that ObjectMapper.

[ombhardwajj]

I've replaced initialization of a new ObjectMapper with the ObjectMapperSingleton already present in avni-server 👍