Remove deprecated SingleRT flow in odsp-driver

[pragya91]

This PR removes an old deprecated path of SingleRT feature in the odsp-driver code. This code was marked as deprecated in #11177 and was marked to be removed with FF version 2.0.0-internal.1.1.0.

The code being removed corresponds to an earlier version of SingleRT feature #7554 where creation of odsp-file and creation of it's sharing link was done through a single network call, by providing the enableShareLinkWithCreate boolean flag to the HostStoragePolicy of odsp-driver.

The newer version of SingleRT feature #11177 is still valid and available to use in the odsp-driver code through enableSingleRoundTripForShareLinkWithCreate boolean flag in HostStoragePolicy. No new changes are done to it.

Motivation of this PR is to cleanup the code, before I make further incremental changes in the same code path which I plan to implement in the coming week

[tylerbutler]

Marking as release blocking to make sure this isn't forgotten for 8.0.

[msfluid-bot]

⯆ @fluid-example/bundle-size-tests: -442 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	505.26 KB	505.31 KB	⯅ +44 Bytes
connectionState.js	680 Bytes	680 Bytes	■ No change
containerRuntime.js	240.76 KB	240.79 KB	⯅ +22 Bytes
loader.js	166.56 KB	166.58 KB	⯅ +22 Bytes
map.js	46.62 KB	46.63 KB	⯅ +11 Bytes
matrix.js	145.05 KB	145.07 KB	⯅ +11 Bytes
odspDriver.js	95.67 KB	95.36 KB	⯆ -323 Bytes
odspPrefetchSnapshot.js	41.58 KB	41.61 KB	⯅ +22 Bytes
sharedString.js	163.94 KB	163.95 KB	⯅ +11 Bytes
sharedTree.js	293.74 KB	293.74 KB	■ No change
Total Size	1.8 MB	1.8 MB	⯆ -442 Bytes

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Baseline commit: d0d77f3

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