Refactor release process

[pchan]

What would you like to be added?

Currently releases are done using scripts (scripts/release.sh). The script is also used for testing. This issue tracks moving releases to targets in Makefile as follows.

 make release
 make test-release
 make publish-release

This involves refactoring the current release.sh file which is used to do a release.

Why is this needed?

The release process sits in one monolith script, which does everything, flags are used to skip steps that will be performed during an actual release (like pushing to git). By modularizing it we can create a clean flow. See #15350 (comment) and #15350 (comment) for details.

See #15350 for more details.

cc: @ahrtr @serathius

[stale]

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