[28.x backport] gha: remove GO_VERSION build-arg from builds #50348
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backport: gha: remove GO_VERSION build-arg from builds #50314
relates to [DNM] update to go1.25rc3 #50313
The same env-var is used for action/setup-go as for overriding the default Go version in Dockerfiles, however action/setup-go only accepts SemVer (e.g. 1.25.0-rc.1) whereas the official golang image follows the Go project's versioning, which doesn't use a SemVer-compatible format (go1.25rc1 / 1.25rc1).
Trying to use the same "GO_VERSION" value for both will therefore fail.
As we're already updating the default version in the Dockerfile to the version we want to use, let's remove the --build-arg, and use the default that's set in the Dockerfile.
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