chore: Do stricter validation of X.509 gossip cert in DAB transactions

[tinker-michaelj]

Description:

• Closes Add more validation to Node's gossipCaCertificate #16645
• Instead of relying on the permissive CertificateFactory.getInstance("X.509") accepting the client's gossip X509 cert bytes, change AddressBookValidator to serialize the given bytes as a PEM X509 certificate; and validate an X509 cert can be parsed from the resulting PEM.

[Neeharika-Sompalli]

LGTM! Thanks @tinker-michaelj

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.35%. Comparing base (4a9dfb7) to head (aa0b34e).
Report is 2 commits behind head on release/0.56.

Additional details and impacted files

@@               Coverage Diff               @@
##             release/0.56   #16666   +/-   ##
===============================================
  Coverage           58.35%   58.35%           
- Complexity          20000    20002    +2     
===============================================
  Files                2738     2738           
  Lines              100489   100491    +2     
  Branches            10378    10378           
===============================================
+ Hits                58643    58645    +2     
  Misses              38214    38214           
  Partials             3632     3632           

Files with missing lines	Coverage Δ
...ressbook/impl/validators/AddressBookValidator.java	91.80% <100.00%> (+0.42%)	⬆️
...ode/app/service/addressbook/AddressBookHelper.java	93.93% <100.00%> (-0.18%)	⬇️

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (4a9dfb7)	100306	62138	61.95%
Head commit (aa0b34e)	100308 (+2)	62140 (+2)	61.95% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#16666)	18	18	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[netopyr]

LGTM - thanks @tinker-michaelj