feat(gradle): use java image for docker mode

[viceice]

Changes:

• gradle/deep and gradle-wrapper managers are now using java docker image.
• moved some code to gradle-wrapper because gradle/deep will be removed in future
• fixed fs usages to use our fs wrapper

Context:

ref #6364

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 tick 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]

Will prepare real test repos to check if it works as expected

[viceice]

https://github.com/viceice-tests/gradle/pulls

[rarkins]

For "deep" gradle, will it work if no gradlew is present?

[viceice]

For "deep" gradle, will it work if no gradlew is present?

Not yet, will add a precommand to dynamically install gradle if no gradlew is found

[viceice]

Ready for review 🎉

[renovate-release]

🎉 This PR is included in version 26.2.0 🎉

The release is available on:

• GitHub release
• 26.2.0

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