ci: Drop ENABLE_HARDENING=OFF from clang-tidy #32087

1. 
   davidgumberg commented at 4:33 am on March 18, 2025: contributor

   Split out from #32071

   It’s not clear why this was added in the first place, but it is not necessary currently.

   #32038 (comment) #24753.

2. ci: Drop ENABLE_HARDENING=OFF from clang-tidy

   It's not clear why this was added in the first place, but it is not
   necessary currently.
   
   https://github.com/bitcoin/bitcoin/pull/32038#issuecomment-2723888193
   https://github.com/bitcoin/bitcoin/pull/24753.

   7d34c19853
3. 
   DrahtBot commented at 4:33 am on March 18, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32087.

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   Type	Reviewers
   ACK	fanquake

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4. DrahtBot added the label Tests on Mar 18, 2025
5. fanquake approved
6. 
   fanquake commented at 4:45 am on March 18, 2025: member

   ACK 7d34c19853e7a5528d69c5f30580e7e9712e61f0
7. fanquake merged this on Mar 18, 2025
8. fanquake closed this on Mar 18, 2025

   ---

9. 
   hebasto commented at 8:43 am on March 18, 2025: member

   Post-merge ACK 7d34c19853e7a5528d69c5f30580e7e9712e61f0.

Contributors
davidgumberg DrahtBot fanquake hebasto

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