[BEAM-12281] Drop support for Flink 1.10

[iemejia]

R: @dmvk @ibzib

[codecov]

Codecov Report

Merging #14906 (22575c7) into master (00eb420) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #14906      +/-   ##
==========================================
+ Coverage   83.78%   83.79%   +0.01%     
==========================================
  Files         435      435              
  Lines       58423    58423              
==========================================
+ Hits        48948    48956       +8     
+ Misses       9475     9467       -8     

Impacted Files	Coverage Δ
...ython/apache_beam/io/gcp/experimental/spannerio.py
...pache_beam/runners/worker/worker_id_interceptor.py
...examples/snippets/transforms/elementwise/filter.py
...ache_beam/runners/interactive/caching/cacheable.py
...uild/srcs/sdks/python/apache_beam/io/tfrecordio.py
...python/apache_beam/examples/wordcount_dataframe.py
...e_beam/examples/complete/game/hourly_team_score.py
...examples/snippets/transforms/aggregation/sample.py
...s/sdks/python/apache_beam/transforms/ptransform.py
...n/apache_beam/examples/cookbook/bigquery_schema.py
... and 860 more

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[je-ik]

LGTM, thanks for the cleanup!
I have one generic question regarding the policy of which version of the runner should be run on the CI. Maybe we can discuss that on the ML.

[je-ik]

nit: I believe the currently released version of 1.12.x is 1.12.4.
Unrelated: Do we have a policy about whic version to run on jenkins? Should it be the most recent one? Looks like we are changing from the last supported (1.10) to the second newest, is this intentional?

[iemejia]

Yes, I kept 1.12.3 because this is run in Dataproc and that's the currently supported version on Dataproc.

[je-ik]

Ah, understood.

[dmvk]

👍 🎉

[ibzib]

LGTM