[Release Tasks Migration] - Updating Build RC local script

[fernando-wizeline]

As part of the Beam Release Process migration to GitHub Actions, the following PR updates the build_release_candidate.sh script, so that the only steps performed locally are the downloading, signing and uploading of the beam artifacts.

Further testing by a release manager will be needed since they're the one with the appropriate credentials to sign and upload the artfifacts.

@kennknowles or @damccorm can you help us to test this script locally?
Thanks!

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[codecov]

Codecov Report

Merging #24684 (568cd44) into master (772c7ce) will increase coverage by 0.04%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #24684 +/- ##
==========================================
+ Coverage 73.36% 73.40% +0.04% 
==========================================
Files 719 721 +2 Lines 97137 97393 +256 ==========================================
+ Hits 71260 71494 +234 - Misses 24529 24551 +22 
Partials 1348 1348 

Flag	Coverage Δ
python	83.02% <ø> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
...ks/python/apache_beam/runners/worker/data_plane.py	87.57% <0.00%> (-1.70%)	⬇️
sdks/python/apache_beam/typehints/schemas.py	88.07% <0.00%> (-0.89%)	⬇️
sdks/python/apache_beam/typehints/row_type.py	100.00% <0.00%> (ø)
...s/python/apache_beam/typehints/testing/__init__.py	100.00% <0.00%> (ø)
...python/apache_beam/typehints/testing/strategies.py	100.00% <0.00%> (ø)
...hon/apache_beam/runners/worker/bundle_processor.py	93.54% <0.00%> (+0.12%)	⬆️
sdks/python/apache_beam/transforms/util.py	96.38% <0.00%> (+0.15%)	⬆️
...ks/python/apache_beam/runners/worker/sdk_worker.py	89.56% <0.00%> (+0.48%)	⬆️
...s/python/apache_beam/runners/worker/log_handler.py	88.40% <0.00%> (+0.79%)	⬆️
...che_beam/runners/interactive/interactive_runner.py	91.77% <0.00%> (+1.26%)	⬆️
... and 1 more

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[damccorm]

@klk could you please try this when you continue the release?

[github-actions]

This pull request has been marked as stale due to 60 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that’s incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the dev@beam.apache.org list. Thank you for your contributions.