[BEAM-12352] Skip GcsIOIntegrationTest.test_copy{,_batch}_rewrite_token tests

[udim]

These rely on a GCS feature that is not currently working.

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ValidatesRunner compliance status (on master branch)

Lang	ULR	Dataflow	Flink	Samza	Spark	Twister2
Go	---			---		---
Java
Python	---			---		---
XLang				---		---

Examples testing status on various runners

Lang	ULR	Dataflow	Flink	Samza	Spark	Twister2
Go	---	---	---	---	---	---	---
Java	---		---	---	---	---	---
Python	---	---	---	---	---	---	---
XLang	---	---	---	---	---	---	---

Post-Commit SDK/Transform Integration Tests Status (on master branch)

Go	Java	Python

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website	Whitespace	Typescript
Non-portable
Portable	---			---	---	---

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GitHub Actions Tests Status (on master branch)

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[udim]

Run Python 3.6 PostCommit

[ibzib]

Thanks Udi!

[codecov]

Codecov Report

Merging #14851 (a9d1f3e) into master (1ee9a42) will increase coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #14851      +/-   ##
==========================================
+ Coverage   83.67%   83.77%   +0.10%     
==========================================
  Files         440      434       -6     
  Lines       59053    58266     -787     
==========================================
- Hits        49412    48812     -600     
+ Misses       9641     9454     -187     

Impacted Files	Coverage Δ
...sdks/python/apache_beam/portability/python_urns.py
...srcs/sdks/python/apache_beam/io/localfilesystem.py
...gcp/datastore/v1new/datastore_write_it_pipeline.py
...cs/sdks/python/apache_beam/io/gcp/gcsfilesystem.py
.../build/srcs/sdks/python/apache_beam/io/aws/s3io.py
...dks/python/apache_beam/transforms/create_source.py
.../examples/snippets/transforms/aggregation/count.py
.../srcs/sdks/python/apache_beam/transforms/window.py
...ild/srcs/sdks/python/apache_beam/utils/profiler.py
...pache_beam/runners/portability/portable_metrics.py
... and 864 more

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[udim]

Verified tests are being skipped: https://ci-beam.apache.org/job/beam_PostCommit_Python36_PR/117/testReport/apache_beam.io.gcp.gcsio_integration_test/GcsIOIntegrationTest/

Postcommit still fails though for another test.