[Chapel Merge] Remove the deprecated c_string to string assignmen

Branch: refs/heads/main
Revision: a0e330e
Author: e-kayrakli
Log Message:

Merge pull request #18239 from e-kayrakli/remove-cstr-assign

Remove the deprecated c_string to string assignment

Removes assignment from c_string to string that was deprecated in #16792.

[Trivial, not reviewed]

Modified Files:
R test/deprecated/cStrAssignment-initeq.good

R test/deprecated/cStrAssignment-proceq.good
R test/deprecated/cStrAssignment.chpl
R test/deprecated/cStrAssignment.execopts
R test/deprecated/cStrAssignment.good
M modules/internal/String.chpl
M test/types/records/split-init/different-types-in-conditional.good

Compare: https://github.com/chapel-lang/chapel/compare/491134730e95...a0e330ecf812