fix(tooltip): only create tooltip on header row/column from title attr

[ghiscoding]

• the feature of that takes the cell content and displays a tooltip when the cell isn't showing the entire text should only be displayed on a slick-cell type, it shouldn't do this action when hovering on a slick header. This was an issue that was found when hovering a select dropdown that ended up showing up the entire list of select options values instead of the selected values

[codecov]

Codecov Report

Merging #915 (9d66b72) into master (609f6c5) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #915   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          245       245           
  Lines        16598     16601    +3     
  Branches      5907      5907           
=========================================
+ Hits         16598     16601    +3     

Impacted Files	Coverage Δ
...es/custom-tooltip-plugin/src/slickCustomTooltip.ts	100.00% <100.00%> (ø)

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