[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)
• 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

• I have read the CONTRIBUTING doc.
• 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]

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 ⚠️
...raries/Opc.Ua.Configuration/ApplicationInstance.cs	83.33%	1 Missing ⚠️
...a.Server/Configuration/ConfigurationNodeManager.cs	88.88%	0 Missing and 1 partial ⚠️
...Security/Certificates/DirectoryCertificateStore.cs	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            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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