Add PCA tab to HTML report

[tsalo]

Closes #1471. We could expand this in the future to include component maps (e.g., if verbose is True) and other PCA-related figures.

Changes proposed in this pull request:

• Create new PCA tab in HTML report for the already-generated PCA-related figures.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.44%. Comparing base (fd18a66) to head (75567b6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1479      +/-   ##
==========================================
+ Coverage   90.43%   90.44%   +0.01%     
==========================================
  Files          31       31              
  Lines        5100     5106       +6     
  Branches      937      937              
==========================================
+ Hits         4612     4618       +6     
  Misses        326      326              
  Partials      162      162              

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[tsalo]

Here's what the new tab looks like