Dcv 2805 env var jinja template call isnt working in sources yaml for dbt core interface

[BAntonellini]

Balboa's _loans.yml

version: 2

sources:
  - name: LOANS
    database: "{{ env_var('DATACOVES__MAIN__DATABASE','DEFAULT') }}"

without this PR
Error registering dbt project in Datacoves Power User <ContextVar name='DBT_INVOCATION_CONTEXT_VAR' at 0x120c18450>

with it

127.0.0.1 - - [09/Aug/2024 09:29:04] "POST /register?project_dir=%2Fconfig%2Fworkspace%2Ftransform&profiles_dir=%2Fconfig%2F.dbt HTTP/1.1" 200 97
127.0.0.1 - - [09/Aug/2024 09:29:04] "GET /health HTTP/1.1" 200 261
127.0.0.1 - - [09/Aug/2024 09:29:04] "GET /health HTTP/1.1" 200 261
127.0.0.1 - - [09/Aug/2024 09:29:04] "GET /parse?reset=false HTTP/1.1" 200 42

manifest.json

"sources": {
    "source.balboa.LOANS.PERSONAL_LOANS": {
      "database": "BALBOA_DEV",
      [...]