Make plotly legendgroup unique

[jj-github-jj]

Fixes #5560

made plotly legendgroup unique to fix single trace enable disable instead of all traces

[codecov-commenter]

Codecov Report

Merging #5570 (e2c934c) into main (c21b981) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5570      +/-   ##
==========================================
- Coverage   88.13%   88.13%   -0.01%     
==========================================
  Files         302      302              
  Lines       62304    62304              
==========================================
- Hits        54911    54910       -1     
- Misses       7393     7394       +1     

Impacted Files	Coverage Δ
holoviews/plotting/plotly/element.py	85.14% <ø> (ø)
holoviews/operation/datashader.py	83.89% <0.00%> (-0.09%)	⬇️

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[jj-github-jj]

Not sure why this single line change is failing only on ubuntu 3.9 only and passing on all other versions. I dont have ubuntu to see what is failing. This is my first pull request with only a single line of code change that is working as expected on my windows machine..Please help.

[hoxbro]

It is a flaky test.

Can you test if legendgroup is needed at all?

[jj-github-jj]

It is a flaky test.

Can you test if legendgroup is needed at all?

Not sure what you mean by if legendgroup is needed at all? It has some functionality in plotly such as enabling/disabling a number of traces together that share a common legendgroup.

[hoxbro]

Nevermind. I will merge it as is.

Thank you for the PR 🥇

[github-actions]

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