src/include/tsan_suppress.h contains helpers with no callers:

• __wt_tsan_suppress_store_uint8_v
• __wt_tsan_suppress_load_size
• __wt_tsan_suppress_load_pointer
• __wt_tsan_suppress_load_wt_insert_ptr
• __wt_tsan_suppress_store_wt_addr_ptr

Remove these redundant helpers.

Extend the existing dist/s_funcs input list to include src/include/tsan_suppress.h. Reuse the existing unused-function check so s_all and s_fast report any future suppression helper that has no repository call site. No new checker is needed.

Acceptance criteria:

• All five unused helpers are removed.
• dist/s_fast passes.
• Adding an unreferenced helper to tsan_suppress.h causes s_funcs to report it.
• No behavioral changes.