Hash the connection string in unit of work api keys

[maliming]

Resolve #26044

The database and transaction api keys of the EF Core, MongoDB and MemoryDb providers contained the resolved connection string, so it reached the logs whenever the key was part of an exception message. The second commit is an unrelated allocation cleanup of ToMd5, ToSha256 and ToSha512.

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[codecov]

Codecov Report

❌ Patch coverage is 26.50602% with 61 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.18%. Comparing base (ccd673c) to head (3945a91).
⚠️ Report is 4 commits behind head on rel-10.7.

Files with missing lines	Patch %	Lines
...eworkCore/Uow/UnitOfWorkDbContextProvider_Tests.cs	0.00%	30 Missing ⚠️
...ryDb/Uow/UnitOfWorkMemoryDatabaseProvider_Tests.cs	0.00%	16 Missing ⚠️
...lo.Abp.Core.Tests/System/StringExtensions_Tests.cs	0.00%	9 Missing ⚠️
...bp/Uow/MongoDB/UnitOfWorkMongoDbContextProvider.cs	70.00%	2 Missing and 1 partial ⚠️
...p/Uow/MemoryDb/UnitOfWorkMemoryDatabaseProvider.cs	60.00%	1 Missing and 1 partial ⚠️
...EntityFrameworkCore/UnitOfWorkDbContextProvider.cs	90.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           rel-10.7   #26047      +/-   ##
============================================
- Coverage     49.20%   49.18%   -0.03%     
============================================
  Files          3806     3808       +2     
  Lines        132482   132527      +45     
  Branches      10043    10047       +4     
============================================
- Hits          65194    65189       -5     
- Misses        65328    65390      +62     
+ Partials       1960     1948      -12     

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