August release testing: Improve cert blob decoding hot path and fix cert validator semaphore regression

[mregen]

Proposed changes

Testing the release bits, the following issues were discovered:

• cert validator semaphore WaitAsync timeout was not correctly handled, also move all semaphores out of try/finally block to follow best practice
• ParseCertBlob shows up in the hot path. API is changed to use ReadOnlyMemory.
• Enum.ToString() was flagged in perf analyzer, changed logger call

Related Issues

• Fixes #

Types of changes

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• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] Enhancement (non-breaking change which adds functionality)
• [ ] Test enhancement (non-breaking change to increase test coverage)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected, requires version increase of Nuget packages)
• [ ] Documentation Update (if none of the other choices apply)

Checklist

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• [x] I have read the CONTRIBUTING doc.
• [x] I have signed the CLA.
• [ ] I ran tests locally with my changes, all passed.
• [ ] I fixed all failing tests in the CI pipelines.
• [ ] I fixed all introduced issues with CodeQL and LGTM.
• [ ] I have added tests that prove my fix is effective or that my feature works and increased code coverage.
• [ ] I have added necessary documentation (if appropriate).
• [ ] Any dependent changes have been merged and published in downstream modules.

Further comments

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 63.15789% with 14 lines in your changes missing coverage. Please review.

Project coverage is 54.68%. Comparing base (4bbb062) to head (be681c5). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...Core/Security/Certificates/CertificateValidator.cs	60.00%	6 Missing and 2 partials :warning:
...ies/Opc.Ua.Server/Server/OpcUaServerEventSource.cs	28.57%	3 Missing and 2 partials :warning:
...a.Core/Security/Certificates/CertificateFactory.cs	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2748 +/- ## ========================================== - Coverage 54.71% 54.68% -0.03% ========================================== Files 349 349 Lines 65683 65689 +6 Branches 13438 13439 +1 ========================================== - Hits 35938 35923 -15 - Misses 25853 25869 +16 - Partials 3892 3897 +5 ```

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[mregen]

updated with semaphore check (most importantly as it can cause a deadlock)