Revert special case to make use of lastsummary's base path when parentSkipRecursion is set (completeSummaryCore)

[NicholasCouri]

Now that we update the summarizer node with its base summary (since PR PR 11809) there is no need to special case and make use of the lastsummary's basepath whenever we have parentSkipRecursion set.

I've kept the test added by [PR 11697)(https://github.com/microsoft/FluidFramework/pull/11697) and made sure it is still passing without the summary upload error.

[msfluid-bot]

⯆ @fluid-example/bundle-size-tests: -194 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	401.74 KB	401.65 KB	⯆ -97 Bytes
connectionState.js	680 Bytes	680 Bytes	■ No change
containerRuntime.js	200.2 KB	200.1 KB	⯆ -97 Bytes
loader.js	154.1 KB	154.1 KB	■ No change
map.js	47.59 KB	47.59 KB	■ No change
matrix.js	138.37 KB	138.37 KB	■ No change
odspDriver.js	152.38 KB	152.38 KB	■ No change
odspPrefetchSnapshot.js	39.75 KB	39.75 KB	■ No change
sharedString.js	158.5 KB	158.5 KB	■ No change
Total Size	1.29 MB	1.29 MB	⯆ -194 Bytes

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Baseline commit: ba1041abbc4085c064d047eea0e7b1c4470b2e76

Generated by :no_entry_sign: dangerJS against 85ccf36bf80c74a123e8a183bfb1e4d95486c065

[ghost]

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