Remove format constraint for igenomes_base

[nvnieuwk]

This pull request removes the format from igenomes base as this was causing some issues with the default s3 path on some infrastructures.

Validation on all paths derived from the igenomes base still happens fully so that also indirectly validates igenomes base when used

[github-actions]

This PR is against the main branch ❌

• Do not close this PR
• Click Edit and change the base to dev
• This CI test will remain failed until you push a new commit

---

Hi @nvnieuwk,

It looks like this pull-request is has been made against the nf-core/tools main branch.
The main branch on nf-core repositories should always contain code from the latest release.
Because of this, PRs to main are only allowed if they come from the nf-core/tools dev branch.

You do not need to close this PR, you can change the target branch to dev by clicking the "Edit" button at the top of this page.
Note that even after this, the test will continue to show as failing until you push a new commit.

Thanks again for your contribution!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.80%. Comparing base (9cf0b98) to head (cb85e5a).
⚠️ Report is 10 commits behind head on dev.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.