[ci] Minor deployment improvements

[vkarak]

This PR provides two things:

1. When deploying ReFrame, update the version sanity check, so that it ignores the build metadata part of the version (i.e., the +hash thing).
2. Update the title of of the release notes.

[codecov-commenter]

Codecov Report

Merging #2447 (4a2e579) into master (050ef43) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2447   +/-   ##
=======================================
  Coverage   85.71%   85.71%           
=======================================
  Files          56       56           
  Lines       10536    10536           
=======================================
  Hits         9031     9031           
  Misses       1505     1505           

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