Fix LatestVersionOfCommonTypesMustBeUsed parity

[msyyc]

Summary

• detect outdated ARM common-type references reachable from HTTP operation parameters and responses
• add regression fixtures for legacy LocationParameter and managed identity v4 usage
• document the latest full-corpus migration evidence
• add the reusable develop-lintdiff-rule workflow skill

Corpus result

Full analysis at specs commit f6b53f105b95da05276530a0754a1c71b4f16397 compiled 462 of 468 projects.

• Swagger validator: 388 projects / 40,692 diagnostics
• TypeSpec rule: 391 projects / 698 diagnostics
• raw same-project overlap: 384 projects
• population-aligned result: 384 validator projects, 384 TypeSpec projects, 384 overlap, no unexplained gaps
• four validator-only projects are stale validator latest-version-map findings
• seven TypeSpec-only projects are older unprojected API versions

Generated coverage and corpus result files are intentionally excluded from this PR. The latest evidence is preserved in migration.md.

Validation

• package build
• targeted harness tests
• targeted rule lint
• all six LatestVersionOfCommonTypesMustBeUsed fixtures
• full specs:typespec corpus run

[msyyc]

Closed because this rule PR must use a rule-specific branch in Azure/typespec-azure and target feature/lintdiff-migration-new. Superseded by Azure#5203.