Add support for yarn 4

[xnyo]

https://github.com/grafana/logs-drilldown/actions/runs/21841792325/job/63027761827?pr=1742

https://raintank-corp.slack.com/archives/C01C4K8DETW/p1770743718380439

Run grafana/plugin-ci-workflows/actions/internal/plugins/frontend@ci-cd-workflows/v4.0.0
  with:
    plugin-directory: .
    npm-registry-auth: false
  env:
    DEFAULT_NODE_VERSION: 22
    DEFAULT_GO_VERSION: 1.24
    DEFAULT_GOLANGCI_LINT_VERSION: 1.64.8
    DEFAULT_TRUFFLEHOG_VERSION: 3.90.6
    GCS_ARTIFACTS_BUCKET: integration-artifacts
    VAULT_INSTANCE: ops
    GOTOOLCHAIN: local
Run /opt/actions-runner/_work/_actions/grafana/plugin-ci-workflows/ci-cd-workflows/v4.0.0/actions/internal/plugins/frontend/pm.sh install
  /opt/actions-runner/_work/_actions/grafana/plugin-ci-workflows/ci-cd-workflows/v4.0.0/actions/internal/plugins/frontend/pm.sh install
  shell: /usr/bin/bash --noprofile --norc -e -o pipefail {0}
  env:
    DEFAULT_NODE_VERSION: 22
    DEFAULT_GO_VERSION: 1.24
    DEFAULT_GOLANGCI_LINT_VERSION: 1.64.8
    DEFAULT_TRUFFLEHOG_VERSION: 3.90.6
    GCS_ARTIFACTS_BUCKET: integration-artifacts
    VAULT_INSTANCE: ops
    GOTOOLCHAIN: local
    PACKAGE_MANAGER: 
Running 'install' with yarn...
error This project's package.json defines "packageManager": "yarn@4.5.0". However the current global version of Yarn is 1.22.22.

Presence of the "packageManager" field indicates that the project is meant to be used with Corepack, a tool included by default with all official Node.js distributions starting from 16.9 and 14.19.
Corepack must currently be enabled by running corepack enable in your terminal. For more information, check out https://yarnpkg.com/corepack.
Error: Process completed with exit code 1.