Fixes various Flutter framework test failures when bytecode is enabled.

Reland "AOT support for Linux Desktop I: switch Linux builds to assemble (#41612)" (#42030)" (#42038)

This reverts commit 142a8630.

This reverts commit 3024053c.

Moves the generated config into that directory. Matches the structure of
the other desktop projects.

Also fixes #40265

On macOS and iOS, the build mode is converted to lowercase in the
Flutter-side script, allowing projects to pass configuration names
directly. This adds the same behavior to the tool_backend.dart script
currently used by Windows and Linux, so that Windows builds can do the
same (since the default configuration names used by VS, as in Xcode,
start with a capital letter).

Moves files generated in windows/flutter/ as part of the build to an ephemeral/ subdirectory, matching the approach used on macOS (and in the future, Windows).

Adds that directory to the generated properties file to minimize hard-coding of paths in the project.

This reverts commit 72cacb40.

This reverts commit 202c1b42.

The name is very misleading at this point, since it does substantially
more than build flutter_assets. Name it more generically as a wrapper
for 'assemble' for macOS builds.

An optimization to the coverage collection speed was added in #30811. This commit further expands on it to parameterize the CoverageCollector with a custom predicate, allowing internal use cases to filter the RPC calls to the Dart VM based on scripts of interest to coverage collection.

Slight cleanup of file locations in flutter_tools
to make it easier to see which files are responsible
for data reporting.

* more ui-as-code

* address review comments

- Adds desktop projects to ApplicationPackageStore
- Plumbs target overrides through the desktop builds

This is done via `flutter build bundle`.   As a consequence, this PR introduces a new way to disable analytics via the `FLUTTER_SUPPRESS_ANALYTICS` env flag.

This reverts commit 445505d6.

Rather than macos/Flutter containing a mixture of files that should and
shouldn't be checked in, create clear locations for:
- Files that are "owned" by Flutter, but should be checked in
  (Flutter/). This will contain files like the top-level Flutter
  xcconfigs, generated plugin registrants, etc.
- Files that are generated by Flutter on the fly, and should not be
  checked in (Flutter/ephemeral/). This will contain Flutter SDK caches,
  the generated xcconfig, etc.

Also adds Flutter-owned Debug and Release xcconfig variants, in
preparation for PodSpec tooling.

Invoking msbuild with runInShell makes handling path escaping more
error-prone, and substantially increases the chances of running into
maximum path limits. This replaces the direct call with a .bat wrapper
that calls vsvars64.bat then msbuild, and uses relative paths within the
script to keep command lengths short.

Fixes https://github.com/flutter/flutter/issues/32792

Corects a bnuch of typeos throuhgout teh Fluter codebsae.

Made use of the `misspell` tool:
https://github.com/client9/misspell