fix: strip data-controller attribute

[adrianthedev]

Description

Fixes an issue where the panel data-controller attribute would have an extra empty space.

Before:

data-controller="resource-edit "

After

data-controller="resource-edit"

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[codeclimate]

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[Paul-Bob]

It is good to merge after fixing the failing feature test

[github-actions]

This PR has been merged into main. The functionality will be available in the next release.

Please check the release guide for more information.