[7.x] [kbn/optimizer] only build specified themes (#70389)

[spalger]

Backports the following commits to 7.x:

• [kbn/optimizer] only build specified themes ([kbn/optimizer] only build specified themes #70389)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 23e203c

Build metrics

@kbn/optimizer bundle module count

id	value	diff	baseline
advancedSettings	21	+4	17
canvas	807	+20	787
charts	158	+4	154
console	35	+4	31
core	376	+12	364
dashboard	114	+4	110
data	204	+4	200
devTools	15	+4	11
discover	111	+28	83
embeddable	37	+4	33
expressions	100	+4	96
graph	96	+4	92
home	162	+4	158
indexManagement	150	+4	146
indexPatternManagement	46	+12	34
infra	603	+4	599
ingestManager	357	+4	353
ingestPipelines	257	+12	245
inputControlVis	14	+4	10
inspector	37	+4	33
kibanaLegacy	26	+4	22
kibanaReact	245	+12	233
lens	116	+28	88
licenseManagement	95	+4	91
management	23	+8	15
maps	459	+4	455
mapsLegacy	123	+4	119
ml	388	+32	356
monitoring	200	+76	124
navigation	17	+4	13
painlessLab	16	+4	12
regionMap	157	+4	153
remoteClusters	70	+4	66
rollup	135	+4	131
savedObjects	21	+4	17
searchprofiler	30	+4	26
security	264	+44	220
share	27	+4	23
snapshotRestore	29	+4	25
spaces	116	+44	72
tileMap	159	+4	155
transform	157	+4	153
triggers_actions_ui	141	+40	101
uiActionsEnhanced	28	+4	24
upgradeAssistant	24	+4	20
visTypeMarkdown	165	+8	157
visTypeMetric	165	+8	157
visTypeTable	170	+8	162
visTypeTagcloud	167	+8	159
visTypeTimelion	175	+8	167
visTypeTimeseries	323	+4	319
visTypeVega	187	+8	179
visTypeVislib	238	+8	230
visualizations	26	+4	22
visualize	200	+16	184
watcher	47	+4	43
total	-	+580	-

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