chore: allow api/sdk/experimental release type mismatch

[pichlermarc]

Which problem is this PR solving?

Current release automation does not deal well with bumps to the API that are not equal to the bumps on the SDK. Since we want to publish a patch API release, this allows mismatches in the release type. It broadens the allowed combinations:

Examples:

API patch -> SDK patch -> Experimental patch (allowed today)
API minor -> SDK minor -> Experimental minor (allowed today)
API patch -> SDK minor -> Experimental minor (not allowed today even though it's a valid combination, allowed after this PR is merged)

Works towards unblocking open-telemetry/opentelemetry-browser#98

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.74%. Comparing base (733d6e4) to head (dee5567).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6501   +/-   ##
=======================================
  Coverage   95.74%   95.74%           
=======================================
  Files         364      364           
  Lines       11972    11972           
  Branches     2828     2828           
=======================================
  Hits        11462    11462           
  Misses        510      510           

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[david-luna]

LGTM