Reorganize component model wast testing (#11818)

* Move all `*.wast` tests under `tests/misc_testsuite/component-model`,
e.g. move` component-model-async` to `component-model/async`.
* Split testi

Reorganize component model wast testing (#11818)

* Move all `*.wast` tests under `tests/misc_testsuite/component-model`,
e.g. move` component-model-async` to `component-model/async`.
* Split testing of `component-model-{stackful,async-builtins}` into
separate tests instead of intermingling it with all other tests.

This is done to in theory make this easier to upstream into the
component model repository itself by having a cleaner split by feature
rather than being a pure reflection of historical development.

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