minor: backport diagonal annotation placement

[rowanxshi]

Description

see #5729

Attribution

• I am listed in the appropriate version of .zenodo.json for PRs against v2 or PRs against master (see How to get acknowledged #3503)

Things to consider

• Does it work on log scales?
• Does it work in layouts?
• Does it work in recipes?
• Does it work with multiple series in one call?
• PR includes or updates tests?
• PR includes or updates documentation?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.36%. Comparing base (fa65e7d) to head (1e89572).
⚠️ Report is 249 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (fa65e7d) and HEAD (1e89572). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (fa65e7d)	HEAD (1e89572)
	6	3

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5730      +/-   ##
==========================================
- Coverage   89.77%   82.36%   -7.41%     
==========================================
  Files          40       45       +5     
  Lines        8780     9693     +913     
==========================================
+ Hits         7882     7984     +102     
- Misses        898     1709     +811     

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