Update fuzz tester to use new TreeViewAlpha apis

[daesunp]

Description

Updates the fuzz tester to use SchematizingSimpleTreeView instead of TreeViewAlpha.

[msfluid-bot]

Code Coverage Summary

No packages impacted by the change.

---

Baseline commit: 6330f4a
Baseline build: 308667
Happy Coding!!

Code coverage comparison check passed!!

[msfluid-bot]

⯅ @fluid-example/bundle-size-tests: +245 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	467.24 KB	467.27 KB	⯅ +35 Bytes
azureClient.js	564.01 KB	564.06 KB	⯅ +49 Bytes
connectionState.js	724 Bytes	724 Bytes	■ No change
containerRuntime.js	263.43 KB	263.45 KB	⯅ +14 Bytes
fluidFramework.js	428.31 KB	428.32 KB	⯅ +14 Bytes
loader.js	134.18 KB	134.19 KB	⯅ +14 Bytes
map.js	42.71 KB	42.71 KB	⯅ +7 Bytes
matrix.js	150.15 KB	150.16 KB	⯅ +7 Bytes
odspClient.js	529.85 KB	529.89 KB	⯅ +49 Bytes
odspDriver.js	97.88 KB	97.9 KB	⯅ +21 Bytes
odspPrefetchSnapshot.js	42.81 KB	42.83 KB	⯅ +14 Bytes
sharedString.js	166.23 KB	166.24 KB	⯅ +7 Bytes
sharedTree.js	418.76 KB	418.77 KB	⯅ +7 Bytes
Total Size	3.38 MB	3.38 MB	⯅ +245 Bytes

---

Baseline commit: 6330f4a

Generated by 🚫 dangerJS against d7c1e4f

Copilot reviewed 5 out of 5 changed files in this pull request and generated no suggestions.

Tip: If you use Visual Studio Code, you can request a review from Copilot before you push from the "Source Control" tab. Learn more