Exclude competing @Deprecated factory methods in fallback String-to-Object converter

[jodastephen]

This extends the fallback String to Object converter algorithm to exclude deprecated methods. This occurs after the existing algorithm finished. As such, any code that works today will continue to work. It is possible that this PR will make some code that fails today start to work, but that seems to be an acceptable outcome.

Release notes will need adding.

Fixes #4996

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Definition of Done

• There are no TODOs left in the code
• Method preconditions are checked and documented in the method's Javadoc
• Coding conventions (e.g. for logging) have been followed
• Change is covered by automated tests including corner cases, errors, and exception handling
• Public API has Javadoc and @API annotations
• Change is documented in the User Guide and Release Notes