feat(manager/gradle): replace individual value matchers with placeholder

[Churro]

Changes

• Replace all occurrences of qConcatExpr(qTemplateString, qPropertyAccessIdentifier, qVariableAccessIdentifier) with a qValueMatcher expression. The purpose is to eliminate code redundancies and to abstract away different value types from matching patterns.

• extract.ts: Don't override the Maven datasource, registry URLs and depType for deps from other ecosystems. E.g., assuming a Jib container image, a node version or npm dependencies are extracted from Gradle files, then Maven-specific dep attributes shouldn't be set.

Context

• feat(manager/gradle): extend support for property accessors #19974
• https://github.com/renovatebot/renovate/issues/18746
• Gradle - Support npm dependencies in Kotlin JS and multiplatform #19920 (comment)

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[viceice]

marked as feature because of behavior change

[Churro]

Could this be merged, please?

[renovate-release]

🎉 This PR is included in version 34.122.0 🎉

The release is available on:

• GitHub release
• 34.122.0

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