fix(Heatmap): rename `options` prop to `option` to be consistent
All other charts expose charts options via an `option` property, the heatmap chart should follow the same pattern
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mentioned in commit a1af1fec 
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mentioned in merge request gitlab!159988 (merged) 
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mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!338 (merged) 
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mentioned in merge request status-page!903 
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mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3956 (merged) 
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mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!726 (closed) 
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mentioned in merge request gitlab!160451 (merged) 
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mentioned in merge request gitlab!160452 (merged) 
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mentioned in merge request gitlab!160668 (closed) 
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mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3970 (merged) 
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mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3972 (merged) 
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mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!43 (merged) 
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mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!45 (merged) 
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mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!783 (closed) 
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mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!811 (closed) 
