Document ef6.exe and retire migrate.exe guidance

[Copilot]

The migration utility documentation described the obsolete migrate.exe workflow and incorrectly stated that SQL scripts could not be generated. The team-environment guide also lacked working links to its migration screencasts.

• EF6 command-line tooling
  • Replace the migrate.exe page with ef6.exe database update guidance.
  • Document NuGet cache discovery, common commands, SQL script generation, and legacy option equivalents.
  • Update navigation and references, with a redirect from the previous URL.

ef6.exe database update --assembly MyApp.dll --script > migration.sql

• Migration screencasts
  • Restore links to the “Under the Hood” and “Team Environments” videos.
  • Use the corrected “Under the Hood” URL.

• Fixes Document ef6.exe and remove doc for migrate.exe #1740

[Copilot]

Pull request overview

This PR updates the EF6 documentation set to retire the obsolete migrate.exe guidance and replace it with ef6.exe database update documentation, along with navigation/reference updates and a redirect from the previous URL.

Changes:

• Replaced the migrate.exe documentation page with a new ef6.exe page covering common migration scenarios and SQL script generation.
• Updated EF6 navigation (TOC) and “past releases” references to point to the new ef6.exe page.
• Added an Open Publishing redirect from the removed migrate-exe.md URL to the new ef6-exe page.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
entity-framework/toc.yml	Swaps the “Use Migrate.exe” nav entry to “Use ef6.exe”.
entity-framework/ef6/what-is-new/past-releases.md	Updates the EF5 resource list link from migrate-exe to ef6-exe.
entity-framework/ef6/modeling/code-first/migrations/migrate-exe.md	Removes the obsolete migrate.exe guidance page.
entity-framework/ef6/modeling/code-first/migrations/ef6-exe.md	Adds new ef6.exe database update documentation including script generation and option mapping.
.openpublishing.redirection.json	Redirects the old migrate-exe.md path to the new ef6-exe URL.

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