[Server] Allow Subject Name Change of Application Certificate in GDS Push scenario

[romanett]

Proposed changes

Extend CertificateIdentifier to allow Certificate to be found by applicationUri in addition to the subject name. This allows an Administator to perform a certificate update and changing the subject name specified in the application certificate during the process

Related Issues

• Fixes #

Types of changes

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] Enhancement (non-breaking change which adds functionality)
• [ ] Test enhancement (non-breaking change to increase test coverage)
• [x] 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

• [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

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 77.14286% with 8 lines in your changes missing coverage. Please review.

Project coverage is 55.28%. Comparing base (ce33d63) to head (ce0b808).

Files with missing lines	Patch %	Lines
...ore/Security/Certificates/CertificateIdentifier.cs	58.33%	3 Missing and 2 partials :warning:
...raries/Opc.Ua.Configuration/ApplicationInstance.cs	83.33%	1 Missing :warning:
...a.Server/Configuration/ConfigurationNodeManager.cs	88.88%	0 Missing and 1 partial :warning:
...Security/Certificates/DirectoryCertificateStore.cs	75.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2833 +/- ## ========================================== - Coverage 55.70% 55.28% -0.42% ========================================== Files 352 352 Lines 67332 67345 +13 Branches 13806 13813 +7 ========================================== - Hits 37506 37233 -273 - Misses 25792 26029 +237 - Partials 4034 4083 +49 ```

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