Fix incorrectly checking for invalid environment variables in the tool (#164101)
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This PR removes a check that looks for the use of Flutter version
related Dart define keys in the environment variables (not Dart defines)
of the user of the Flutter tool. We don't need to check the environment
variables, we only need to check the user defined Dart defines.
Here's how it currently works:
1. User builds a Flutter app via tool
2. tool checks environment variables for Flutter version related Dart
define keys and throws if it finds and (_and_)
3. tool checks list of user defined Dart defines for Flutter version
related Dart define keys and throws if it finds any
This PR removes the check in step 2, since step 3 is what we actually
care about.
The `FLUTTER_GIT_URL` environment variable is set on forks and the Dart
define is used to make that information available to applications at
runtime. However, environment variables don't propagate to be Dart
defines, thus the above mentioned check is not needed.
*List which issues are fixed by this PR. You must list at least one
issue. An issue is not required if the PR fixes something trivial like a
typo.*
Fixes #164093
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link to the migration guide as per the [breaking change policy].*
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