feat: add consolidated module-index JSON files and auto-update workflow

[jaredfholgate]

Summary

Adds three consolidated module-index JSON files under docs/static/module-indexes/, plus the tooling and CI to keep them in sync with the existing CSV indexes.

Generated JSON files

File	Shape	Purpose
modules.json	sorted array	Merged Bicep + Terraform module data. Resource modules are matched on ProviderNamespace+ResourceType so each resource appears once with both ecosystems nested under it. Pattern and utility modules are listed per ecosystem.
bicep.json	map keyed by ModuleName	Minimal { moduleType, displayName, status } — designed to be consumed by the Bicep VS Code extension AVM provider (PR #18958).
terraform.json	map keyed by ModuleName	Terraform equivalent of bicep.json.

All files are deterministic, UTF-8 (no BOM), LF line endings, sorted, trailing newline.

New tooling

• utilities/tools/platform/Set-ModuleIndexesJson.ps1 — generator. Reads the six CSVs (BicepResourceModules.csv, BicepPatternModules.csv, BicepUtilityModules.csv and the Terraform equivalents), normalises the rows (drops the ModuleOwnersGHTeam column), matches resource modules across ecosystems, and writes the three JSONs.
• utilities/pipelines/sharedScripts/New-AutoMergePullRequest.ps1 — generic shared helper for any future "regenerate file → open & auto-merge PR" workflow. Takes a file list, branch prefix, title and a body with a {{CHANGED_FILES}} placeholder; uses git status --porcelain (handles untracked-on-first-run); creates a timestamped branch, opens a PR via gh and merges with --admin (or --auto if -Admin is omitted). Validated with -WhatIf.

New workflow

.github/workflows/platform.updateModuleIndexesJson.yml:

• Triggers on push to main when any of the source CSVs, the generator script, the shared PR helper or this workflow itself change, plus workflow_dispatch. (No cron — all inputs are in-repo, so there is nothing to drift between pushes.)
• Authenticates as the AVM GitHub App using AVM_APP_CLIENT_ID / AVM_APP_PRIVATE_KEY (same secrets as avm-terraform-governance).
• Configures git identity dynamically as <app-slug>[bot] with the correct <id>+<app-slug>[bot]@users.noreply.github.com email (governance pattern).
• Regenerates the JSONs and calls New-AutoMergePullRequest to publish them via an auto-merged PR.
• All steps run in pwsh; permissions: contents: read (writes go through the App token).

Notes / open questions

• Workflow uses environment: platform (this repo's existing convention). avm-terraform-governance uses environment: avm — happy to switch if preferred.
• Merge mode is --admin for an immediate auto-merge. If branch protection is configured to reject this for App identities, swap to --auto in the workflow's New-AutoMergePullRequest call (just drop the -Admin switch).

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[jtracey93]

@jaredfholgate are we going to close this in favour of our other approach we have planned to flip this around?

[jaredfholgate]

@jaredfholgate are we going to close this in favour of our other approach we have planned to flip this around?

Yes. I'll close this for now. This was triggered by the Bicep VSCode extension PR, but I think we can solve that by adding what they need to the existing metadata endpoint instead?