Fixes https://github.com/flutter/flutter/issues/132157

The `getIsolate` method returns the full list of libraries which can be huge for large apps. Using the more speficic API to only fetch what we need improves hot reload performance.

*Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.*

*List which issues are fixed by this PR. You must list at least one issue.*

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*

This reverts commit a19b3436.

We added this logging to try and determine if the reason for Dart VM errors (https://github.com/flutter/flutter/issues/121231) was caused by some issue with the streams.
A recent test proves that is not the case:
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_ios%20platform_view_ios__start_up/11046/overview
The test shows the Dart VM url in the device log. However, the test log does NOT show a log for the Dart VM url but does show the stack trace, which all come from the main stream, which means it's not an issue with the secondary streams not receiving the log.

So reverting the debugging we added.

Reland https://github.com/flutter/flutter/pull/127222 that was reverted in https://github.com/flutter/flutter/pull/127405.

Fixed `Mac_ios microbenchmarks_ios` test failure by not echoing logs twice.

https://github.com/flutter/flutter/issues/120408

[Focus] Add run key command to dump the focus tree

Observatory can still be enabled by providing `--serve-observatory` or
invoking the `_serveObservatory` private service RPC via web socket or
HTTP.

Related to https://github.com/dart-lang/sdk/issues/50233

Revert "[flutter_tools] Remove sound null safety flag (#123031)"

[flutter_tools] Remove sound null safety flag #2

This reverts commit 7c3088cf.

[flutter_tools] Remove sound null safety flag

Adds vmservices for getting iOS build options

This reverts commit 275ab9c6.

Revert "Reland "Remove references to Observatory (#118577)""

This reverts commit 298d8c76.

* lerp documentation

* Remove Note, Note That from repo

* Improve BorderSide documentation.

* apply review comments

This reverts commit 2df140f4.

Observatory is being deprecated for Dart 3.0 so it should no longer be
referenced in tooling messaging / flags.

See https://github.com/dart-lang/sdk/issues/50233

This reverts commit 254a796b.

Revert "Reland "Add --serve-observatory flag to run, attach, and test (#118402)" (#119529)" (#119729)

This reverts commit 7477d7ac.

* [flutter_tools] Fix parsing of existing DDS URIs from exceptions

Fixes #118609.

* Fix formatting
Co-authored-by: Christopher Fujino <fujino@google.com>

* Fix formatting
Co-authored-by: Christopher Fujino <fujino@google.com>

---------
Co-authored-by: Christopher Fujino <fujino@google.com>

* Reland "Add --serve-observatory flag to run, attach, and test (#118402)"

This reverts commit 86ab01d2.

* Fix flaky failures

* Fix VM service disappearing failure

This reverts commit 6cd4fa45.

This flag will allow for Observatory to be served by the VM service once it is disabled by default in the Dart SDK.

You can now specify a --local-web-sdk flag to point to a wasm_release folder. This will make it so that only artifacts that pertain to the web sdk are overridden to point to the wasm_release folder. Other artifacts (such as impellerc) will pull from the cache, or from the --local-engine path if that is specified.

This also uses precompiled platform kernel files for both ddc and dart2js

Revert "[web] Add `--local-web-sdk` flag and use precompiled platform kernels for dart2js and ddc (#114639)" (#115242)

This reverts commit 0e9ee367.

* Dart2JS build step looks for compiled platform binaries.

* Use new locations of platform binaries.

* Added --local-web-sdk command line flag.

* Need to use the matching frontend server when doing ddc stuff.

* Update packages/flutter_tools/lib/src/test/web_test_compiler.dart
Co-authored-by: Mouad Debbar <mouad.debbar@gmail.com>

* Update packages/flutter_tools/lib/src/runner/flutter_command_runner.dart
Co-authored-by: Mouad Debbar <mouad.debbar@gmail.com>

* Formatting issues.

* Need to use URI format for platform dill.

* Fix resident runner tests.

* Fix analysis issue.

* Fix and add unit tests.

* Add some useful comments.

* Refine doc comments for flags.
Co-authored-by: Mouad Debbar <mouad.debbar@gmail.com>

This reverts commit 0ad71e87.