Bump GLQL to 0.40.0

What does this MR do and why?

Bumps gitlab_query_language and @gitlab/query-language-rust to 0.40.0 (Gemfile, Gemfile.lock, Gemfile.next.lock, package.json, yarn.lock). Integration work is tracked in glql#233 (closed).

0.40.0 adds two new DuoWorkflows metrics, openMrCount and creditsPerMergedMrRatio. This MR wires up the monolith-side presenters for both, under app/assets/javascripts/glql/:

• value_format.js: the five openMrCount* variants (Min, Max, Mean, Sum, Quantile) use the count unit. creditsPerMergedMrRatio uses the credits unit, with 2 decimals in cells and compact formatting on chart axes.
• presenter_registry.js: openMrCount* use NumberPresenter, creditsPerMergedMrRatio uses CreditsPresenter.
• stat.js: adds stat descriptions for the six metrics. creditsPerMergedMrRatio sets positiveDirection: 'down', so the stat trend badge treats a decrease as good - a cheaper merged change is the point of the metric. openMrCount* keep the count unit's default up, same as createdMrCount*.
• locale/gitlab.pot regenerated.

Docs:

• doc/user/glql/data_sources/duo_workflows.md: two 19.5 history entries (glql!534 (merged), glql!533 (merged)), six new metric rows whose first sentence matches the stat description, the credits authorization note extended to cover creditsPerMergedMrRatio (gated by read_agent_artifacts, same as creditsUsed), the lag note extended to cover openMrCount (same reconciliation as merged/closed, so a recently merged MR can still count as open), and the "Flows by status" example gains openMrCountSum as "MRs open".
• doc/user/glql/data_sources/merge_requests.md: documents the new reviewState filter (alias reviewStates) - a query fields table row, a "Review state" section with the six values, operators =, !=, in, semantics notes (matches when at least one reviewer is in the state; cannot be combined with reviewer = any or reviewer = none), and a "waiting for a first review" example. This is the commit from !256125 (closed) by another author, cherry-picked here with attribution kept; !256125 (closed) was closed in favour of this MR.

No frontend code enumerates merge request filters, so reviewState needs no presenter change.

Related glql MRs shipped in 0.40.0

• glql!508 (merged) - adds the reviewState filter.
• glql!534 (merged) - adds the openMrCount measurement.
• glql!533 (merged) - adds the creditsPerMergedMrRatio metric.
• glql!517 (merged) - numeric literals above i64::MAX are now a compile error instead of being silently accepted. Fixes glql#174 (closed). No monolith integration needed.
• glql!532 (merged) - scopes GraphQL variable numbering to a single compilation. No monolith integration needed.
• glql!509 (merged) - keeps emoji outside the Unicode BMP intact in generated GraphQL. No monolith integration needed.

Screenshots

Verified on GDK with the released 0.40.0 gem and npm package. Blocks 1-5 ran against local ClickHouse, where synthetic merge request ids were seeded into the Duo workflow rows because the local rows have none. Blocks 6-8 ran against gitlab.com data (project gitlab-org/charts/gitlab) through the local remote-GLQL redirect. openMrCount is already served by gitlab.com; creditsPerMergedMrRatio was not deployed there yet at the time, hence the local run.

GLQL	Screenshot
title: "Duo workflows by status (since June 2026)" display: table mode: analytics query: type = DuoWorkflow and group = "gitlab-org" and created > 2026-06-01 dimensions: status as "Status" metrics: totalCount as "Flows", createdMrCountSum as "MRs created", mergedMrCountSum as "MRs merged", closedMrCountSum as "MRs closed", openMrCountSum as "MRs open" sort: status asc
title: "Duo created merge requests by outcome" display: lineChart mode: analytics query: type = DuoWorkflow and group = "gitlab-org" and created > 2026-06-01 dimensions: created(monthly) as "Month" metrics: createdMrCountSum as "Opened", mergedMrCountSum as "Merged", closedMrCountSum as "Closed", openMrCountSum as "Still open" sort: created asc
title: "Open merge requests per flow, by flow type" display: table mode: analytics query: type = DuoWorkflow and group = "gitlab-org" and created > 2026-06-01 dimensions: flowType as "Flow" metrics: totalCount as "Flows", openMrCountSum as "Open MRs", openMrCountMean as "Avg per flow", openMrCountMax as "Max per flow", openMrCountQuantile(0.9) as "p90 per flow" sort: openMrCountSum desc
title: "Cost per merged change" display: stat mode: analytics query: type = DuoWorkflow and group = "gitlab-org" and created > 2026-06-01 metrics: creditsPerMergedMrRatio
title: "Credits per merged merge request, by month" display: table mode: analytics query: type = DuoWorkflow and group = "gitlab-org" and created > 2026-06-01 dimensions: created(monthly) as "Month" metrics: creditsUsedSum as "Credits", mergedMrCountSum as "MRs merged", creditsPerMergedMrRatio as "Credits per merged MR" sort: created asc
title: "Waiting for a first review" display: table query: type = MergeRequest and project = "gitlab-org/charts/gitlab" and state = opened and draft = false and reviewState = unreviewed fields: title, author, reviewer, updated sort: updated asc limit: 8
title: "Reviewed or changes requested" display: table query: type = MergeRequest and project = "gitlab-org/charts/gitlab" and state = opened and draft = false and reviewState in (reviewed, requested_changes) fields: title, reviewer, approved sort: updated desc limit: 8
Expected compile error: display: table query: type = MergeRequest and project = "gitlab-org/charts/gitlab" and state = opened and reviewer = any and reviewState = approved fields: title, reviewer