Add release notes for DevTools 2.51.1

[elliette]

Add release notes for the 2.51.1 hotfix version of DevTools. This is version of DevTools that is going out with Flutter 3.38.

Includes the release notes for 2.51.0 along with the release notes for the cherry-picks included in 2.51.1 (see flutter/devtools@v2.51.0...v2.51.1)

[gemini-code-assist]

Summary of Changes

Hello @elliette, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the release notes for DevTools version 2.51.1, which is a hotfix release accompanying Flutter 3.38. The notes detail various general improvements, bug fixes in the Inspector and Network Profiler, and enhanced integration with VS Code, ensuring users are informed of the latest changes and stability improvements.

Highlights

• General Updates: Flutter beta channel users are now opted into the DevTools-on-Wasm experiment, with other users able to enable it via settings.
• General Updates: Horizontal scrollbars have been added to data tables for improved navigation.
• General Updates: Data table columns can now be resized by dragging header separators.
• Inspector Updates: An issue was fixed where selecting a widget in the Inspector incorrectly opened the widget definition file instead of the user's project file.
• Network Profiler Updates: The layout of the 'error count' badge in the tab name has been fixed.
• Network Profiler Updates: Display of 'Response Headers' and 'Request Headers' when no headers are present has been corrected.
• Network Profiler Updates: A banner now clearly indicates when DevTools is not logging network requests.
• VS Code Updates: macOS shortcuts like Cmd+C and Cmd+V now function correctly when DevTools is embedded within VS Code.

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[gemini-code-assist]

Code Review

This pull request adds the release notes for DevTools version 2.51.1. The notes are well-structured and clear. I have one suggestion to improve formatting consistency within the document.

[gemini-code-assist]

For consistency with other release note entries, please add a period at the end of the sentence. The current formatting with the dash on a new line is also inconsistent with other items in this list. I suggest combining this into a single line and letting it wrap naturally.

Suggested change

	- On macOS, shortcuts like `Cmd`+`C` and `Cmd`+`V` now work when DevTools is
	embedded inside VS Code -
	[#9472](https://github.com/flutter/devtools/pull/9472)
	- On macOS, shortcuts like `Cmd`+`C` and `Cmd`+`V` now work when DevTools is embedded inside VS Code. - [#9472](https://github.com/flutter/devtools/pull/9472)

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit 754b148):

https://flutter-docs-prod--pr12659-devtools-release-notes-2-51-ap8ilcsl.web.app

[parlough]

Thanks!