Remove chemistry tests

[bknueven]

Fixes/Resolves N/A

Summary/Motivation:

The water chemistry tests based the Generic Reaction / Parameter Blocks have been a pain to maintain, and do not seem to be of importance anymore. This PR would remove these tests.

Changes proposed in this PR:

• Remove the directory watertap/examples/chemistry

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.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (66eb651) 94.80% compared to head (dc55462) 94.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1229      +/-   ##
==========================================
- Coverage   94.80%   94.78%   -0.03%     
==========================================
  Files         354      353       -1     
  Lines       35515    35454      -61     
==========================================
- Hits        33669    33604      -65     
- Misses       1846     1850       +4     

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[adam-a-a]

Sad to see them go, but I understand.