FBBT: Add tolerances to tests

[blnicho]

Summary/Motivation:

Following the latest NumPy release a couple FBBT tests started failing. I added a machine precision tolerance to the failing tests following #2445 as an example.

Changes proposed in this PR:

• Add machine precision tolerance to a couple fbbt tests

Legal Acknowledgement

By contributing to this software project, I have read the contribution guide and agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the BSD license.
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.

[michaelbynum]

Thanks, @blnicho!

[codecov]

Codecov Report

Base: 87.06% // Head: 87.05% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (f4c1120) compared to base (3119236).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2675      +/-   ##
==========================================
- Coverage   87.06%   87.05%   -0.01%     
==========================================
  Files         757      757              
  Lines       84449    84449              
==========================================
- Hits        73525    73517       -8     
- Misses      10924    10932       +8     

Flag	Coverage Δ
linux	84.50% <ø> (-0.01%)	⬇️
osx	?
other	84.68% <ø> (+<0.01%)	⬆️
win	81.83% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyomo/contrib/mindtpy/iterate.py	79.54% <0.00%> (-1.82%)	⬇️
pyomo/solvers/plugins/solvers/ASL.py	90.00% <0.00%> (-1.43%)	⬇️
pyomo/common/download.py	92.17% <0.00%> (-0.44%)	⬇️
pyomo/core/expr/visitor.py	93.24% <0.00%> (-0.16%)	⬇️

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