Go SDK: GCS FS supports rename, improved test coverage. Local FS supports copy.

[jeremyje]

Fixes #26064

All changes are for the Go SDK.

• Add support for renaming GCS files. This is performed by a copy and then delete so it is not atomic. The Java implementation follows this approach.
• Add support for Copy in Local FileSystem.
• Add test coverage for the GCS FileSystem implementation. This adds a new test dependency to github.com/fsouza/fake-gcs-server/fakestorage.

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[codecov]

Codecov Report

Merging #26065 (850549e) into master (5558859) will increase coverage by 0.03%.
The diff coverage is 53.12%.

@@            Coverage Diff             @@
##           master   #26065      +/-   ##
==========================================
+ Coverage   71.18%   71.21%   +0.03%     
==========================================
  Files         787      787              
  Lines      103298   103330      +32     
==========================================
+ Hits        73528    73588      +60     
+ Misses      28288    28245      -43     
- Partials     1482     1497      +15     

Flag	Coverage Δ
go	53.82% <53.12%> (+0.12%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...dks/python/apache_beam/options/pipeline_options.py	94.02% <ø> (ø)
sdks/go/pkg/beam/io/filesystem/gcs/gcs.go	59.45% <52.63%> (+47.50%)	⬆️
sdks/go/pkg/beam/io/filesystem/local/local.go	59.52% <53.84%> (-2.55%)	⬇️

... and 2 files with indirect coverage changes

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[damccorm]

assign to next reviewer

[github-actions]

Assigning reviewers. If you would like to opt out of this review, comment assign to next reviewer:

R: @jrmccluskey for label go.
R: @pabloem for label io.

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[jrmccluskey]

Run GoPortable PreCommit

[jrmccluskey]

Run Go PreCommit

[jrmccluskey]

Run GoPortable PreCommit

[jrmccluskey]

Run RAT PreCommit

[jrmccluskey]

Run Whitespace PreCommit

[jrmccluskey]

LGTM mod the change to CHANGES.md. I'll merge when that's updated. Thank you!

[jeremyje]

Updated the CHANGES.md file.

[jeremyje]

Rebased with latest changes and reran go mod tidy since there were conflicts.

[jrmccluskey]

I don't think Jenkins picked up the precommits for some reason, let me see if I can get it to run...

[jrmccluskey]

retest this please

[jrmccluskey]

Thank you for your contribution and your patience while we got everything tested!