docs: fix copy-paste javadoc and typos in comments

[Avicennasis]

Summary

Fix 11 documentation and comment defects across 3 files. No functional changes.

src/main/java/com/jfrog/ide/common/utils/PackageFileFinder.java — four javadoc summaries were copy-paste duplicates that described the wrong thing:

• getNpmPackagesFilePairs: "Get package.json directories and their directories" -> "Get package.json files and their parent directories"
• the yarn.lock, build.gradle and go.mod getters each carried that same package.json sentence -> each now names its own file type
• @return FileVisitResult.CONTINUE or FileVisitResult.SKIP_SUBTREE respectfully -> respectively (x2)
• "Skip sub directories without permissions" -> "subdirectories"

src/main/java/com/jfrog/ide/common/ci/CiManagerBase.java — subject/verb agreement in the producer-consumer javadoc, plus "produce-consumer job" -> "producer-consumer job" and "artifactory" -> "Artifactory".

src/main/java/com/jfrog/ide/common/npm/NpmTreeBuilder.java — "Errors occurred during building" -> "while building".

The PackageFileFinder group is the substantive one: the four getters were documented as returning directories when they return file/parent pairs, and three of them named the wrong file entirely.

Comments and javadoc only.

[coderabbitai]

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