fix(vitest): delegate snapshot options to workspace from root config

[hi-ogawa]

Description

• Closes vitest run --update doesn't work for workspaces #5194

Since SnapshotManager is a singleton managed by main Vitest instance, I think WorkspaceProject.getSerializableConfig needs to use the same options as:

vitest/packages/vitest/src/node/core.ts

Line 101 in ec55fdd

this.snapshot = new SnapshotManager({ ...resolved.snapshotOptions })

I expect snapshot options to do something similar to coverage options, which is also root config only options:

vitest/packages/vitest/src/node/workspace.ts

Line 332 in ec55fdd

coverage: this.ctx.config.coverage,

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[hi-ogawa]

Just in case, one more note: this change doesn't affect snapshot update during watch mode ("u" command) since configOverride still overrides in getSerializableConfig:

vitest/packages/vitest/src/node/workspace.ts

Line 378 in cad955b

}, this.ctx.configOverride || {} as any) as ResolvedConfig

I also manually verified "u" command still works.