feat(dh): graphql eslint

[ManBearTM]

This PR adds linting rules for .graphql files (both operations AND schema, each with separate config), hopefully preventing some obscure bugs (such as the one outlined in https://github.com/Energinet-DataHub/greenforce-frontend/pull/3494).

I have turned off some of the rules for now, since the PR would be way too big if I had to fix all the linting errors at once (yeah there are a few 😄). I plan to follow up with smaller PR's where I fix each lint error one at a time and then a final PR where I turn the rule(s) on.

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Test results for \apps\dh\api-dh\source\DataHub.WebApi.Tests\bin\Release\net8.0\Energinet.DataHub.WebApi.Tests.dll

1 tests   1 :white_check_mark:  2m 43s :stopwatch: 1 suites  0 :zzz: 1 files    0 :x:

Results for commit 08c03634.

:recycle: This comment has been updated with latest results.