feat(preset): add Gradle group

[JuJup]

Changes

Adds a preset for Gradle Version updates.

It is based on the nodeJs group.
Explicitly not using groupName, see discussion in this PR: #34379

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

[astellingwerf]

This file is about group presets, not about commit messages

[viceice]

it's modeled fater this:

renovate/lib/config/presets/internal/group.ts

Lines 389 to 405 in 930fb7c

	nodeJs: {
	description:
	"Group anything that looks like Node.js together so that it's updated together.",
	packageRules: [
	{
	commitMessageTopic: 'Node.js',
	matchDatasources: ['docker', 'node-version'],
	matchPackageNames: [
	'/(?:^|/)node$/', // node or ends with "/node, except those below"
	'!calico/node',
	'!docker.io/calico/node',
	'!ghcr.io/devcontainers/features/node',
	'!kindest/node',
	],
	},
	],
	},

[JuJup]

See this discussion: #34379