ensure that the terminal handler checks if the service protocol is enabled before calling debug toggle brightness. Also removes globals from TerminalHander and test cases.

Fixes #65477

This reverts commit 48ce83a8.

* b49de93b3 Create an ImageHandle wrapper (flutter/engine#21057)

* b0fb2c8a9 Roll Skia from 7b97b3cb2bd0 to 59b2a92c96ba (4 revisions) (flutter/engine#21365)

Otherwise the heuristics we have may decide to skip running pub. We should consider reducing the number of dimensions of caching here to a single check optimized for the run/test case.

* [Docs] [Icons] Updating dart doc styles to recognize more styles of icons. All the 4 icon styles we support have to be pulled from 4 individual web fonts when we show the html page for api docs.

* Better documentation and that special awful case.

* Couple more places to remove.

Complete the migration to the TextSelectionTheme by deprecating the opt-in flag and text selection properties in ThemeData. (#66482)

* Fixes typos in showDialog documentation

* disable pub lints

* + comments

Registering the service worker immediately after the documented has loaded may cause SW initialization to compete with framework initialization. It was recommended to us that we defer the service worker setup until after the framework is done with setup, which should be sometime after the first frame.

To implement this, I augmented the binding setup to dispatch an event on the document after the binding has initialized. I don't see any obvious risks with this setup.

Fixes #66066

This should be a mostly non breaking change for hot reload workflows that improves performance, but if you see anything odd with hot reload behavior on master please file a bug. This feature can also be disabled without any changes to the SDK with flutter config --no-single-widget-reload-optimization 

Delete the destination directory for the web sdk before copying the new contents. This might fix an error where the OS refuses to overwrite the files on dev

* migrate some cupertino files to nullsafety

* address review comments

Improve our ability to measure the performance of hot restart. Also flush all UI thread tasks before calling the hot restart "complete" in benchmark mode.

If this is successful at stabilizing the benchmarks, this should be enabled for "normal" hot restart so that we can accurately track execution time.

Based on feedback from various desktop developers, and to be consistent between the defaults and the sample code, this PR switches the default for visual density in desktop themes to be compact instead of standard.

It also removes the same setting from the sample code generated by "flutter create" because it is no longer needed now that it is the default.

Updates all null safe dependencies to versions that allow 2.10 stable and 2.11 dev releases.

Also updates flutter_goldens and flutter_goldens_client to allow 2.11 dev.

The throttle duration could delay past the point where the destination sink was closed. Check if it is closed before adding an event. Fixes a crash on dev: StateError: Bad State: Stream is already closed.