Remove convertToSummaryTreeWithStats from DDSs

[scarlettjlee]

Change remaining summarizeCore implementations to directly create ISummaryTreeWithStats instead of creating ITree and then converting. This completes the work started in #8592 which changed the return type from ITree to ISummaryTreeWithStats.

There are uses of conversion functions in container runtime (will be fixed with #8286), summarizer node, and data stores so I can't remove them yet.

I'll remove the fullTree parameter in summarizeCore in a separate PR to keep this change cleaner.

Closes #8652

[msfluid-bot]

⯆ @fluid-example/bundle-size-tests: -2.26 KB

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	380.69 KB	380.14 KB	⯆ -566 Bytes
containerRuntime.js	179.55 KB	179.36 KB	⯆ -194 Bytes
loader.js	160.56 KB	160.56 KB	■ No change
map.js	51.18 KB	50.99 KB	⯆ -194 Bytes
matrix.js	146.13 KB	145.51 KB	⯆ -632 Bytes
odspDriver.js	190.9 KB	190.75 KB	⯆ -157 Bytes
odspPrefetchSnapshot.js	44.69 KB	44.69 KB	■ No change
sharedString.js	167.1 KB	166.55 KB	⯆ -567 Bytes
Total Size	1.32 MB	1.32 MB	⯆ -2.26 KB

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Baseline commit: 90b900a

Generated by 🚫 dangerJS against 8291570

[anthony-murphy]

This is awesome. So happy to see this getting cleaned up.

[vladsud]

It's easy to make mistake here and not notice.
Can you please validate that each case you touched

• has UT covering summarization
• OR covered in snapshot tests (i.e. there is file that touches that DDS)
• OR we validated summarization manually (by running some sample that uses it).