Category: Track automatically added labels

[kurkle]

Fixes: #9599
Closes: #9601

Automatically added labels were never cleaned up. This adds tracking of the labels that are added and removes those at the start of every update cycle.

scale.init is called every update by buildOrUpdateScales here:

Chart.js/src/core/core.controller.js

Line 330 in 67aa6eb

scale.init(scaleOptions, options);

[kurkle]

Filename	Size	Change
dist/chart.esm.js	73.2 kB	+122 B (0%)
dist/chart.js	92.6 kB	+120 B (0%)
dist/chart.min.js	65.8 kB	+73 B (0%)