fix: Boolean toggles in the Trigger Dag / FlexibleForm params grid were

[singlaamitesh]

Fixes #67852

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Boolean toggles in the Trigger Dag / FlexibleForm params grid were left-aligned right after the label instead of sharing the right edge with other controls; added width='full' and justifyContent='flex-end' to FieldBool's Switch so it right-aligns within its control column like AF2's FAB trigger form. The newsfragment was already present but untracked, so it was staged with git add to satisfy the changelog check.

How this was tested: airflow dags test

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