Rename ActionMetadata.funtion_name to function_name

[SAY-5]

Tracking issue

Closes #7558

Why are the changes needed?

The protobuf field ActionMetadata.funtion_name is misspelled (missing the c in "function"). The typo is exposed through the generated stubs in every language and the published flyteidl2 package that the Python SDK depends on, so the misspelled name leaks into public API surfaces.

What changes were proposed in this pull request?

• flyteidl2/workflow/run_definition.proto: rename field funtion_name to function_name, keeping wire number 13 so the change is backward-compatible on the wire.
• runs/service/run_service.go: update the two hand-written references (actionMetadataFromModel and the metadata assignment around line 1832) from FuntionName to FunctionName.

The gen/ stubs are generated and need make buf, which I do not have the toolchain for locally. Per the issue's note, I'll comment /regen on this PR so CI regenerates and commits the Go/Python/TypeScript/Rust stubs.

How was this patch tested?

gofmt -l runs/service/run_service.go reports no formatting issues, and grep -rn "funtion" . returns nothing outside the still-to-be-regenerated gen/ stubs. The Go backend will build once the stubs are regenerated via /regen, since runs/... is the only hand-written consumer of the renamed proto symbol.

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[SAY-5]

/regen