[GC] Remove used routes state from data store context

[agarwal-navin]

Currently, if a data store is not realized and updateUsedRoutes() is called on it, the used routes are saved and are passed on the child DDSes (and their summarizer nodes) during data store realization. This PR removes storing the used routes state from data store context. The summarizer node should pass this information directly to the child summarizer node for couple of reasons:

• If the realization of the data store fails after the child summarizer node is created, the child node will not have used routes leading to inconsistent state. This has happened in production before.
• Since the used routes along with other GC state is maintained and tracked by the summarizer nodes, the data stores should not be saving it as that leaks the state to different layers.

AB#3448

[msfluid-bot]

⯆ @fluid-example/bundle-size-tests: -35 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	457.99 KB	457.95 KB	⯆ -35 Bytes
azureClient.js	555.23 KB	555.21 KB	⯆ -21 Bytes
connectionState.js	680 Bytes	680 Bytes	■ No change
containerRuntime.js	258.67 KB	258.62 KB	⯆ -56 Bytes
fluidFramework.js	406.94 KB	406.96 KB	⯅ +14 Bytes
loader.js	134.04 KB	134.05 KB	⯅ +14 Bytes
map.js	42.13 KB	42.14 KB	⯅ +7 Bytes
matrix.js	146.41 KB	146.42 KB	⯅ +7 Bytes
odspClient.js	523.37 KB	523.35 KB	⯆ -21 Bytes
odspDriver.js	97.55 KB	97.57 KB	⯅ +21 Bytes
odspPrefetchSnapshot.js	42.61 KB	42.62 KB	⯅ +14 Bytes
sharedString.js	163.13 KB	163.14 KB	⯅ +7 Bytes
sharedTree.js	397.46 KB	397.46 KB	⯅ +7 Bytes
Total Size	3.3 MB	3.3 MB	⯆ -35 Bytes

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Baseline commit: 4c0c130f1df720694a1a1cab7fd0f22f792baac1

Generated by :no_entry_sign: dangerJS against 18101b8c1980847342e26a830886a714757b1f2c