fix(serverless): cap a source archive at the API's 10 MiB limit

[Ryank90]

Summary

• Lower the source-archive cap from 25 MiB to 10 MiB so packing fails locally when the archive would be rejected by SourceUploadCreate.declaredByteLength (maximum 10485760).

Test plan

• go test ./internal/cmd/serverless/ -run 'PackDirectory_TotalTooLarge|PackDirectory_FileTooLarge'
• A tree between 10 and 25 MiB is rejected before upload, and the error names the 10 MiB limit

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[wilsonsilva]

Checked the new zip cap with a random tree and a compressible one, both behave as expected now. Thanks!