[release/2.0] Update blob upload to use managed identity (#22647)

[Abe27342]

Description

Updates the blob upload steps to use the pipeline's identity as authentication rather than a storage key.

Cherry-pick of #22647

[msfluid-bot]

⯅ @fluid-example/bundle-size-tests: +238 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	452.24 KB	452.27 KB	⯅ +35 Bytes
azureClient.js	550.86 KB	550.91 KB	⯅ +49 Bytes
connectionState.js	680 Bytes	680 Bytes	■ No change
containerRuntime.js	256.06 KB	256.07 KB	⯅ +14 Bytes
fluidFramework.js	375.11 KB	375.12 KB	⯅ +7 Bytes
loader.js	133.46 KB	133.48 KB	⯅ +14 Bytes
map.js	41.1 KB	41.11 KB	⯅ +7 Bytes
matrix.js	143.39 KB	143.4 KB	⯅ +7 Bytes
odspClient.js	518.97 KB	519.02 KB	⯅ +49 Bytes
odspDriver.js	97.26 KB	97.28 KB	⯅ +21 Bytes
odspPrefetchSnapshot.js	42.32 KB	42.33 KB	⯅ +14 Bytes
sharedString.js	159.9 KB	159.91 KB	⯅ +7 Bytes
sharedTree.js	375.09 KB	375.1 KB	⯅ +7 Bytes
Total Size	3.22 MB	3.22 MB	⯅ +238 Bytes

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Baseline commit: 4f5e66acb8dbf4cb19a0548e418d7676fcdb4e39

Generated by :no_entry_sign: dangerJS against 70dbb6bc9ac6cabd1f142e1086b62d4c04d21f06

[microsoft-github-policy-service[bot]]

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