Add use_public_ips to Go Dataflow Runner

[jrmccluskey]

Adds handling for being passed use_public_ips instead of no_use_public_ips. Adds some extra validation to throw an error if provided both flags with the same value.

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[jrmccluskey]

@lostluck I didn't love this approach, but it looks like there's no easy way to have an alias flag where the meaning is opposite to the actual boolean being stored?

[jrmccluskey]

CC: @bvolpato

[codecov]

Codecov Report

Merging #28308 (e8766d5) into master (d616fc2) will decrease coverage by 0.02%.
Report is 57 commits behind head on master.
The diff coverage is 52.94%.

@@            Coverage Diff             @@
##           master   #28308      +/-   ##
==========================================
- Coverage   72.28%   72.27%   -0.02%     
==========================================
  Files         678      679       +1     
  Lines       99958   100000      +42     
==========================================
+ Hits        72256    72271      +15     
- Misses      26126    26152      +26     
- Partials     1576     1577       +1     

Flag	Coverage Δ
go	53.59% <52.94%> (-0.03%)	⬇️

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Files Changed	Coverage Δ
sdks/go/pkg/beam/runners/dataflow/dataflow.go	62.50% <52.94%> (+0.63%)	⬆️

... and 12 files with indirect coverage changes

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[lostluck]

LGTM

Agreed. It's rough. Not sure if we can do much better though.

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