HPCC-35525 Add rudimentary Global Metrics page

[GordonSmith]

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[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-35525

Jirabot Action Result:
Workflow Transition To: Merge Pending
Updated PR

[Copilot]

Pull request overview

This PR adds a new Global Metrics page to the ECL Watch web interface, providing visibility into system-wide metrics with date range filtering capabilities. The implementation includes routing, menu integration, localization support, and updates to webpack configuration and dependencies.

Key Changes:

• New GlobalMetrics React component with date range filtering and grid display of normalized metrics
• Updated webpack configuration to improve source map generation and module handling
• Enhanced formatCost function to support unit offset for flexible cost calculations

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
esp/src/webpack.config.js	Removed "use strict" removal plugin, updated source-map-loader test pattern to include .mjs/.cjs files, changed devtool to full "source-map" for better debugging
esp/src/src/Session.ts	Added optional unitOffset parameter to formatCost function for flexible cost unit adjustments
esp/src/src-react/routes.tsx	Added /global-stats routes under both topology and operations sections
esp/src/src-react/hooks/diskUsage.ts	Removed unused XREFDirectories interface and WsDFUXRefEx import
esp/src/src-react/components/Menu.tsx	Added GlobalMetrics menu items to topology and operations submenus
esp/src/src-react/components/GlobalMetrics.tsx	New component implementing global metrics page with date picker controls, data grid, and custom formatters for durations and costs
esp/src/src-dojo/nls/*/hpcc.ts	Added "Dimensions" and "GlobalMetrics" localization entries across all language files
esp/src/package.json	Updated @hpcc-js dependencies to newer versions (chart 3.6.1, comms 3.13.0, etc.)

[GordonSmith]

@ghalliday this is a rudimentary implementation so we can look at the data - my test data was very sparse to say the least...