add HERA_TOKEN env var to user pods

[Adam-D-Lewis]

Reference Issues or PRs

Fixes #2437

There is a sister PR for the docs - nebari-dev/nebari-docs#444

What does this implement/fix?

Put a x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

Any other comments?

[Adam-D-Lewis]

On the local integration test, it seems that the jupyterlab user server took too long https://github.com/nebari-dev/nebari/actions/runs/8918268633/job/24492607383?pr=2438 to spin up, but I don't think anything failed. Retriggering.