v0.38.1-cherry-pick-afbd9c4

go: support "all:" prefix for "go:embed" directives (#3455)

* Handle "all:" prefix for go:embed

* lint go/tools/builders

* embedcfg: prevent bad names including folders from known VCS from being embedded

Also added TODOs documenting deviations from the native toolchain implementation

* Apply suggestions from code review

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Co-authored-by: Fabian Meumertzheim <fabian@meumertzhe.im>