r11s-driver: fix prefetch uncaught exceptions

[znewton]

Description

PrefetchDocumentStorageService includes many fire-and-forget API calls. However, it uses the void keyword to mark those as intentionally un-awaited, rather than using .catch(() => {}) to explicitly catch and ignore errors. This results in Unhandled Promise Rejection errors that crash the runtime if those API calls fail.

To fix this, I'm simply replacing the void uses with .catch(() => {}).

Resolves #22214

TODO:

• [ ] Add Regression Tests
• [ ] Confirm with issue creator that disabling prefetch mitigates the issue.

[msfluid-bot]

⯅ @fluid-example/bundle-size-tests: +293 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	457.84 KB	457.88 KB	⯅ +35 Bytes
azureClient.js	555.02 KB	555.11 KB	⯅ +97 Bytes
connectionState.js	680 Bytes	680 Bytes	■ No change
containerRuntime.js	258.65 KB	258.67 KB	⯅ +14 Bytes
fluidFramework.js	403.74 KB	403.75 KB	⯅ +14 Bytes
loader.js	134.2 KB	134.22 KB	⯅ +14 Bytes
map.js	42.25 KB	42.25 KB	⯅ +7 Bytes
matrix.js	146.42 KB	146.42 KB	⯅ +7 Bytes
odspClient.js	523.16 KB	523.21 KB	⯅ +49 Bytes
odspDriver.js	97.66 KB	97.68 KB	⯅ +21 Bytes
odspPrefetchSnapshot.js	42.72 KB	42.73 KB	⯅ +14 Bytes
sharedString.js	163.12 KB	163.13 KB	⯅ +7 Bytes
sharedTree.js	394.25 KB	394.26 KB	⯅ +7 Bytes
Total Size	3.29 MB	3.29 MB	⯅ +293 Bytes

---

Baseline commit: 1a86c7d256838b797c736bd7be602189654ff80a

Generated by :no_entry_sign: dangerJS against a06fa7eb2ea7241621a210494dcae008acc53f0f

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

This PR has been automatically marked as stale because it has had no activity for 60 days. It will be closed if no further activity occurs within 8 days of this comment. Thank you for your contributions to Fluid Framework!