JSF: skip looking for managed/named beans on incompatible JSF versions

[NicolaIsotta]

• do not search CDI Named beans on JSF 2.1- (CDI support was introduced in 2.2)
• do not search managed beans on Faces 4.0 or upper since support was removed

small code refactors/modernization

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[NicolaIsotta]

Just a note: the current behavior doesn't actually cause errors or exceptions - the main purpose of the PR is performance