test(tree): event test clean up

[jenn-le]

moves some event tests to tree view test file and changes them to be less undo redo focused

[msfluid-bot]

Code Coverage Summary

No packages impacted by the change.

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Baseline commit: e603044
Baseline build: 307393
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	465.5 KB	465.54 KB	⯅ +35 Bytes
azureClient.js	562.82 KB	562.87 KB	⯅ +49 Bytes
connectionState.js	724 Bytes	724 Bytes	■ No change
containerRuntime.js	262.12 KB	262.14 KB	⯅ +14 Bytes
fluidFramework.js	427.12 KB	427.13 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	149.84 KB	149.85 KB	⯅ +7 Bytes
odspClient.js	528.61 KB	528.66 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	165.77 KB	165.78 KB	⯅ +7 Bytes
sharedTree.js	417.58 KB	417.58 KB	⯅ +7 Bytes
Total Size	3.37 MB	3.37 MB	⯅ +245 Bytes

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Baseline commit: e603044

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