Rails5 fix passing Group objects array into for_projects_and_groups milestone scope

Closes #47836

See merge request gitlab-org/gitlab-ce!19863

Expose single merge request within a project GraphQL query

See merge request gitlab-org/gitlab-ce!19853

This allows the user to get a single MR nested in a GraphQL project
query.

Since we need the full path and the iid anyway, this makes more sense
than having a root query that needs the full path as well.

Update .gitignore with ignoring package-lock.json

See merge request gitlab-org/gitlab-ce!19890

Fix "[Rails5] '-1' is not a valid data_store"

Closes #47369

See merge request gitlab-org/gitlab-ce!19882

IDE sends last commit ID when committing changes

Closes #46192

See merge request gitlab-org/gitlab-ce!19552

Removes unused imports and prettifies code

See merge request gitlab-org/gitlab-ce!19888

[CE backport] Backport InternalRedirect#sanitize_redirect

See merge request gitlab-org/gitlab-ce!19795

Closes #46192

Resolve "Make the html attribute on the blob json call optional"

Closes #46668

See merge request gitlab-org/gitlab-ce!19479

Fix flakey time-sensitive remove deploy key spec

See merge request gitlab-org/gitlab-ce!19800

Fix indentation for 'Current status' section

See merge request gitlab-org/gitlab-ce!19884

Remove line regarding future feature of assigning ancestor group milestones

See merge request gitlab-org/gitlab-ce!19865