* Move web integration tool tests to web.shard
Web integration tool tests depend on DDC changes in SDK. This change
moves them to a separate shard and subshard so CI bot configurations
can run them separately.
In particular, with will allow running those tests on dart CI flutter
HHH web bot instead of a non-web one, allowing early detection and easy
classification of issues caused by SDK changes as VM- or Web related.
* Enabled verbose mode for flaky web_tool_tests
* fixed local engine crash with --enable-asserts
* Disable failing tests, fix local engine with asserts
* Removed mac web_tool_tests bot
* Addressed CR comments
* Add disabled mac web_tool_tests and disable win web_tool_tests
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