[core] FileCollector.addFile ignores language parameter

[adangel]

Affects PMD Version: 6.45.0

Description:

When using FileCollector.addFile(Path, Language), the language is ignored. Still the file
extension is used to determine the actual language.

See #3952 for a use case.

Example code:

        Language language = LanguageRegistry.getLanguage("html");
        try (PmdAnalysis pmd = PmdAnalysis.create(config)) {
            pmd.files().addFile(Paths.get("componentes", "myComponent.cmp"), language);
            Report report = pmd.performAnalysisAndCollectReport();
        }

Running PMD through: Other

[adangel]

As discussed in #3971, this should also cover the case addFile(TextFile), where TextFile itself provides a specific language already.