Upload coverage reports on merge

[CaptainIRS]

In this PR:

• The coverage report workflow is run on merge as well so that the coverage of the main branch can be obtained and used as a basis for comparing the coverage of PRs.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@2cdd46d). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1433   +/-   ##
=======================================
  Coverage        ?   55.56%           
=======================================
  Files           ?      103           
  Lines           ?     4451           
  Branches        ?      676           
=======================================
  Hits            ?     2473           
  Misses          ?     1435           
  Partials        ?      543           

Flag	Coverage Δ
caliper-core	44.31% <0.00%> (?)
caliper-fabric	80.46% <0.00%> (?)
generator-caliper	83.62% <0.00%> (?)

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

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