[flutter_tools] remove all references to .packages in tool tests #106210
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Context dart-lang/sdk#48272
Pub is no longer creating .packages file, however the tool still has some tests that are creating a mock one (e.g. https://github.com/flutter/flutter/blob/496049263e4efd68ced664ee2c90db9c93f08571/packages/flutter_tools/test/general.shard/plugins_test.dart). These tests should be updated to instead create a .dart_tool/package_config.json file which is what pub is now generating.
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Important issues not at the top of the work listTechnical debt, code quality, testing, etc.Owned by Flutter Tool teamAffects the "flutter" command-line tool. See also t: labels.Issues that have been deemed still valid as part of the Flutter Tools issue cleanup initiative.Triaged by Flutter Tool team