[7.x] [Lens] Categorical color palettes (#75309)

[flash1293]

Backports the following commits to 7.x:

• [Lens] Categorical color palettes ([Lens] Categorical color palettes #75309)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: ba3a82a

Metrics [docs]

@kbn/optimizer bundle module count

id	before	after	diff
canvas	1118	1115	-3
charts	39	49	+10
lens	565	558	-7
total			-0

async chunk count

id	before	after	diff
charts	0	1	+1

async chunks size

id	before	after	diff
canvas	1.3MB	1.3MB	+9.3KB
charts	0.0B	57.4KB	+57.4KB
lens	1.0MB	1024.0KB	-26.7KB
visTypeTimeseries	1.7MB	1.7MB	+6.0B
visTypeVislib	702.2KB	702.2KB	+12.0B
total			+40.0KB

distributable file count

id	before	after	diff
default	43062	43058	-4
oss	22705	22710	+5

page load bundle size

id	before	after	diff
canvas	918.4KB	907.8KB	-10.5KB
charts	134.9KB	147.9KB	+13.0KB
lens	49.5KB	49.7KB	+292.0B
visTypeTagcloud	19.5KB	19.6KB	+6.0B
total			+2.8KB

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream