delete sw prop files

[adam-a-a]

Part of #1248

Summary/Motivation:

Remove seawater ion prop pack and seawater ion generic configuration file that was used for IDAES modular property model.

Changes proposed in this PR:

• remove simple seawater ion prop model and config along with associated usages

Legal Acknowledgement

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1. I agree my contributions are submitted under the license terms described in the LICENSE.txt file at the top level of this directory.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.85%. Comparing base (abf7614) to head (7e68581).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1347      +/-   ##
==========================================
+ Coverage   93.80%   93.85%   +0.04%     
==========================================
  Files         339      337       -2     
  Lines       35512    35289     -223     
==========================================
- Hits        33313    33119     -194     
+ Misses       2199     2170      -29     

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[MarcusHolly]

LGTM