Remove mockup storage and inline styles from web componenets todoMVC

[lpardosixtosMs]

The 2 main changes:

1. Remove the lists of todo entries at the app and list level and keep them only as children of the todolist element.
2. Remove inline styling of elements display, use css attribute selectors instead.

Results:

Label	macos.arm64.local_0	macos.arm64.local_1	macos.arm64.local_2	macos.arm64.local_3
browser	Google Chrome	Microsoft Edge	Firefox	Safari
version	138.0.7204.158	138.0.3351.95	138.0.4	18.5.0.0.20621.2.5.11.8
os	macos 15.5 arm64	macos 15.5 arm64	macos 15.5 arm64	macos 15.5 arm64
device	MacBookPro17,1	MacBookPro17,1	MacBookPro17,1	MacBookPro17,1
cpu	Apple M1 8 cores	Apple M1 8 cores	Apple M1 8 cores	Apple M1 8 cores
runs	1	1	1	1
failed runs	0	0	0	0
TodoMVC-WebComponents	11.156666665772597	11.82666666706403	16.333333333333332	20.833333333333517
TodoMVC-WebComponents-Old	13.643333332240582	14.316666669150193	17.9	23.000000000000167
TodoMVC-WebComponents-Complex-DOM	14.856666666269302	14.879999998708566	21.833333333333332	26.400000000000258
TodoMVC-WebComponents-Old-Complex-DOM	18.479999998708568	17.890000000596046	25.033333333333335	27.766666666666666
Score	70.2810070365844	68.97575003170705	50.516728603241944	41.278491693043556

Comparison of sync and async steps:

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