Fix .values()/get_value_generator() dealing with Dynamic params and an updated default value

[maximlt]

Fixes #1057

.param.values() uses .param.get_value_generator() under the hood (this looks all overly complicated but that's another issue) to obtain the value of a Parameter. get_value_generator() seems to be designed to deal specifically with Dynamic Parameters (like Integer, Number, etc.), to return the generator callable. So in cases where there's no generator, we simply return the value.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.46%. Comparing base (4c90671) to head (e0f89d6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1058   +/-   ##
=======================================
  Coverage   87.45%   87.46%           
=======================================
  Files           9        9           
  Lines        4959     4961    +2     
=======================================
+ Hits         4337     4339    +2     
  Misses        622      622           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[philippjfr]

Makes sense.

[esolberg-nr]

thanks!