Add No-cache BFCache to list of performance feature plugins

[westonruter]

This proposes adding No-cache BFCache to the list of performance feature plugins installable via Performance Lab, similar as the non-monorepo Performant Translations plugin is made available:

I brought this up at our last Performance Chat office hours:

@westonruter suggested considering the No-cache BFCache plugin for inclusion in the list of Performance Lab plugins, similar as Performant Translations is.

Enabling bfcache in core is something I'm hoping to include in 6.9 (via Core-63636), so getting additional installations via Performance Lab will be very helpful to get more testing.

With #2122, an admin pointer is also added for this feature:

[github-actions]

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Co-authored-by: westonruter <westonruter@git.wordpress.org>
Co-authored-by: swissspidy <swissspidy@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.60%. Comparing base (32bc144) to head (421cc34).
⚠️ Report is 4 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk    #2119      +/-   ##
==========================================
+ Coverage   67.58%   67.60%   +0.01%     
==========================================
  Files          93       93              
  Lines        7799     7803       +4     
==========================================
+ Hits         5271     5275       +4     
  Misses       2528     2528              

Flag	Coverage Δ
multisite	67.60% <100.00%> (+0.01%)	⬆️
single	36.47% <100.00%> (+0.03%)	⬆️

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[swissspidy]

Makes sense to me