Analyzers: renumber to a single MP#### ID family, add HelpLinkUri, generate per-rule docs

[thomhurst]

Category: analyzers / DX — Breaking: suppressions by old ID

1. IDs are prose ("AsyncModule", "MissingDependsOnAttribute") for 7 rules while newer ones use MPDEP001/2/3 and dev analyzers use MPD0001/2. Prose IDs break dotnet_diagnostic.<id>.severity conventions and can't be prefix-matched.
2. DiagnosticDescriptorFactory.cs:33-41 omits helpLinkUri — the IDE "learn more" link is dead for all 10 rules.
3. docs/docs/how-to/analyzers.md lists 5 of 10 rules, has no IDs/severities/suppression guidance, untouched since 2024.

Fix: renumber to MP#### with AnalyzerReleases Removed/Renamed entries; helpLinkUri → generated per-rule docs pages sourced from AnalyzerReleases.*.md so the docs can't drift.

Part of #3239.

[thomhurst]

Implementation is complete in merged stacked PR #3437 and is contained in open parent PR #3433. Keeping this issue in progress until #3433 reaches the default branch; no duplicate PR needed.

[thomhurst]

Implemented and merged in #3437 (02e044fc08). The merged change renumbers diagnostics, adds HelpLinkUri, generates rule documentation, and validates analyzer/docs drift. Closing the stale issue record.