If you're not listed in the Dependents section, of their 1040, you were not claimed as a dependent. Further verify this by looking at line 13a of their 1040. It should be blank (unless they have other dependents). Also look at line 3 of Schedule 3 to verify that they did not claim the education credit.
I don't know what a "Qualifying Child Information section" is. It sounds like just an accountant's worksheet to see if you qualify. Unless, there is a Schedule EIC with your name on it.
You have to file taxes whether you are a dependent or not, unless you had less than $12,200 of income, for the year, and have no withholding to be refunded.
If your parents didn't claim you, then answer no to the question can you be claimed. Then your HSA contribution is valid.
If you were claimed, then the reason for the excessive contribution is that your are not eligible for an HSA, because you are a dependent.
Graduation year is always "iffy", as to whether a student can be claimed. Technically you should go thru the calculations to see if you can be. But, in reality, the parents and student simply decide between them who will claim you.
If your parents didn't claim the tuition credit, you should claim it, on your return, if you claim yourself. Do not claim the American Opportunity Credit, if your parents have already claimed in 4 times (a May graduation usually means you were in college 5 calendar/tax years).
