copy seed files from airbyte-config/init/build to airbyte-server to be used in migrations

[cgardens]

closes #4412

What

• We need airbyte-server to have access to the generated seed configs to make auto migration work. Instead of having those files live in airbyte-server we continue to generate them in airbyte-config:init but then copy them over to airbyte-server

How

• gradle copy command

While doing this I discovered this bug: https://github.com/airbytehq/airbyte-internal-issues/issues/156. Going to suggest we follow up on it separately and focus on just getting this deduplication of configs fixed. I think the fallout from this bug will generally be low.

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This change is 

[subodh1810]

Tested this locally and is working fine. Automatic migration is also working fine

[subodh1810]

Nice! I think I need to learn gradle better to be able to do these things. I have pushed few commits just to make like fixing tests and making sure everywhere we use airbyte-config now. Tested this locally as well and works fine.

[davinchia]

Reviewed 1 of 1 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @cgardens)