8347958: Minor compiler cleanups relating to MandatoryWarningHandler

[archiecobbs]

After recent improvements to Lint-related classes, there are now a few minor cleanup opportunities relating to MandatoryWarningHandler.

1. The new LintWarning class provides access to the associated LintCategory. This means that the LintCategory parameter being passed to the MandatoryWarningHandler constructor is no longer needed.
2. The prefix string being passed to the MandatoryWarningHandler constructor can (in most cases) be inferred as well.
3. The field Check.sunApiHandler (which has type MandatoryWarningHandler) is no longer used and can be removed.

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Issue

• JDK-8347958: Minor compiler cleanups relating to MandatoryWarningHandler (Enhancement - P5)

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