Revert "Update ITk endcap hits FTAG getters for fast tracking compatibility"

Thomas Streblerrequested to merge
tstreble/athena:FTAGFastRevert into 23.0

This reverts commit 3bf554e2.

Not needed after !63592 (merged), so reverting since there was some concern about long-term use.

FYI @dguest

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