Bump Razor to 10.0.0-preview.25577.1

[davidwengier]

Weekly bump. With this, and the next Roslyn insertion, we can remove the last little bit of non-cohosting (and cohosting hackery)

View Complete Diff of Changes

• Localized file check-in by OneLocBuild Task: Build definition ID 262: Build ID 2848467 (PR: #12539)
• Update after Roslyn insertion (PR: #12535)
• Fix main build (PR: #12528)
• Add the RazorCSharp keywords to completion (PR: #12522)
• TagHelperCollection Part 5: Add weak cache for TagHelperDocumentContext (PR: #12509)
• Remove non-cohost bits from C# extension (PR: #12518)
• Resurrect our integration tests (PR: #12523)
• TagHelperCollection Part 4: Rewrite Tag Helper Discovery(!) (PR: #12507)
• TagHelperCollection Part 3: Optimize tag helper change detection logic in source generator (PR: #12506)
• TagHelperCollection Part 2: Mechanical Updates (PR: #12505)
• TagHelperCollection Part 1: The new bits (PR: #12504)