Bug fix: FixedFeatureAcquisitionFunction should not convert floats to float32 tensors

[esantorella]

Motivation

Addresses #1943

• Dtype fix: floats should be double-precision
• Cleanup for clarity
• Units

Test Plan

Added unit tests

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[codecov]

Codecov Report

Merging #1944 (0fdbe04) into main (81f7c98) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 0fdbe04 differs from pull request most recent head a5946e3. Consider uploading reports for the commit a5946e3 to get more accurate results

@@           Coverage Diff           @@
##             main    #1944   +/-   ##
=======================================
  Coverage   99.94%   99.94%           
=======================================
  Files         177      177           
  Lines       15676    15683    +7     
=======================================
+ Hits        15668    15675    +7     
  Misses          8        8           

Impacted Files	Coverage Δ
botorch/acquisition/fixed_feature.py	100.00% <100.00%> (ø)

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@esantorella merged this pull request in 71fd34e.