Prevent test suite from modifying data/config.yaml file

[lbianchi-lbl]

See: https://github.com/IDAES/idaes-pse/pull/948#discussion_r967367224

[ksbeattie]

Possible fixes:

• get the test to write this file into a tmp dir
• get the test to "clean up after itself" and undo the changes it made to the file
• not have this file in the repo, add it to .gitignore, and have the file generated by the test (then thrown away)

[dangunter]

Short fix would be to remove the test(s) that cause the data file to be modified.

[ksbeattie]

This will be taken care of by the forthcoming retirement of the DMF.

[ksbeattie]

Related to #1368