ci: migrate integration fully to renovate

[p-targowicz]

Part of QA-1485

Dependabot still owned pip docker and ci here so renovate had those categories disabled behind a TODO. Dropped dependabot and removed the guard

Config now follows renovate.json5.sample from mender-qa. Kept both MENDER_ARTIFACT_VERSION custom managers since it is pinned in .gitlab-ci.yml and .env

The 17 compose files at the root are now covered which dependabot never did - only literal image tags like traefik, the MENDER_SERVER_* ones stay with release tooling

Targeting master and 3.8.x. 3.8.x last moved 2026-06-15 so it is still live, while 3.7.x has been quiet since 2025-03 and 3.6.x since 2024-08 so those are left out. Added the standard rule blocking major bumps on maintenance branches

Dependabot only ever opened pip PRs here - its docker entry pointed at extra/mender-client-docker-addons which contains just a README, and there are no merged dependabot docker PRs in this repo

[mender-test-bot]

@p-targowicz, start a full integration test pipeline with:

• mentioning me and start integration pipeline

---

my commands and options

You can prevent me from automatically starting CI pipelines:

• if your pull request title starts with "[NoCI] ..."

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• mentioning me and start client pipeline --pr mender/127 --pr mender-connect/255

You can trigger a client pipeline for a specific Mender Client release with:

• mentioning me and start client pipeline --release 6.0.x (can be given multiple times)
• by default, a pipeline is triggered for each supported release the component is a part of

You can trigger GitHub->GitLab branch sync with:

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 cherry-pick to:
 * 1.0.x
 * 2.0.x

[p-targowicz]

no need for integration tests its just renovate, merging